/*
Programming and DHTML graphics:
Adrian R. Ashford, Sky & Telescope.
v3.1 July 14, 2004.

Parts based on SAMOONS.BAS by Roger Sinnott.

Date & time validation scripts:
Sandeep Tamhankar
stamhankar@hotmail.com
http://javascript.internet.com
*/

function grab_UTC()
{
var nowdate = new Date();
var utc_day = nowdate.getUTCDate();
var utc_month = nowdate.getUTCMonth() + 1;
var utc_year = nowdate.getUTCFullYear();
zone = nowdate.getTimezoneOffset() / 1440;
document.saturn.timezone.value = -(zone * 24);
var utc_hours = nowdate.getUTCHours();
var utc_mins = nowdate.getUTCMinutes();
var utc_secs = nowdate.getUTCSeconds();
utc_mins += utc_secs / 60.0;
utc_mins = Math.floor((utc_mins + 0.5));
if (utc_mins < 10) utc_mins = "0" + utc_mins;
if (utc_mins > 59) utc_mins = 59;
if (utc_hours < 10) utc_hours = "0" + utc_hours;
if (utc_month < 10) utc_month = "0" + utc_month;
if (utc_day < 10) utc_day = "0" + utc_day;
document.saturn.date_txt.value = utc_month + "/" + utc_day + "/" + utc_year;
document.saturn.ut_h_m.value = utc_hours + ":" + utc_mins;
}

function setup()
{
grab_UTC();
reset_flag = 0;
view_type = "binocular";
saturn();
isBinocular();
}

function reloaded()
{
grab_UTC();
saturn();
}

function clear_rings()
{
saturn_0_layer = 7;
saturn_1_n_layer = 7;
saturn_2_n_layer = 7;
saturn_3_n_layer = 7;
saturn_5_n_layer = 7;
saturn_8_n_layer = 7;
saturn_13_n_layer = 7;
saturn_18_n_layer = 7;
saturn_23_n_layer = 7;
saturn_28_n_layer = 7;
saturn_1_s_layer = 7;
saturn_2_s_layer = 7;
saturn_3_s_layer = 7;
saturn_5_s_layer = 7;
saturn_8_s_layer = 7;
saturn_13_s_layer = 7;
saturn_18_s_layer = 7;
saturn_23_s_layer = 7;
saturn_28_s_layer = 7;
}

function proper_ang(big)
{
with (Math)
{
var tmp = 0;
if (big > 0)
{
tmp = big / 360.0;
tmp = (tmp - floor(tmp)) * 360.0;
}
else
{
tmp = ceil(abs(big / 360.0));
tmp = big + tmp * 360.0;
}
}
return tmp;
}

function proper_ang_rad(big)
{
with (Math)
{
var tmp = 0;
if (big > 0)
{
tmp = big / 2 / PI;
tmp = (tmp - floor(tmp)) * 2 * PI;
}
else
{
tmp = ceil(abs(big / 2 / PI));
tmp = big + tmp * 2 * PI;
}
}
return tmp;
}

function round_10(num)
{
return Math.floor((num + 0.05) * 10) / 10;
}

function round_100(num)
{
return Math.floor((num + 0.005) * 100) / 100;
}

function isValidDate(dateStr)
{ 
if (IsValidTime(document.saturn.ut_h_m.value) == true)
{
var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;
var matchArray = dateStr.match(datePat);
if (matchArray == null) { 
alert("Date is not in a valid format.") 
return false; 
} 
var month = matchArray[1];
var day = matchArray[3]; 
var year = matchArray[4];
if (year < 1900 || year > 2100) {
alert("Year must be between 1900 or 2100"); 
return false; 
} 
if (day < 1 || day > 31) {
alert("Day must be between 1 and 31."); 
return false; 
} 
if ((month == 4 || month == 6 || month == 9 || month == 11) && day == 31) {
alert("Month " + month + " doesn't have 31 days!") 
return false 
} 
if (month == 2) {
var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); 
if (day > 29 || (day == 29 && !isleap))
{ 
alert("February " + year + " doesn't have " + day + " days!"); 
return false; 
} 
} 
if (month < 10 && month.length == 1) month = "0" + month;
if (day < 10 && day.length == 1) day = "0" + day;
document.saturn.date_txt.value = month + "/" + day + "/" + year;
var dt_str = document.saturn.date_txt.value;
if ((dt_str.substring(2,3) != "/") || (dt_str.substring(5,6) != "/"))
{
alert ("Date is not in a valid format.");
return false;
}
saturn();
return true;
}
else
{
return false;
}
}

function IsValidTime(timeStr)
{
var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
var matchArray = timeStr.match(timePat);
if (matchArray == null)
{
alert("Time is not in a valid format.");
return false;
}
var hour = matchArray[1];
var minute = matchArray[2];
if (hour < 0 || hour > 23)
{
alert("Hour must be between 0 and 23.");
return false;
}
if (minute < 0 || minute > 59)
{
alert ("Minute must be between 0 and 59.");
return false;
}
if (hour < 10 && hour.length == 1) hour = "0" + hour;
if (minute < 10 && minute.length == 1) minute = "0" + minute;
document.saturn.ut_h_m.value = hour + ":" + minute;
var tm_str = document.saturn.ut_h_m.value;
if ((tm_str.substring(2,3) != ":") && (dt_str.length != 5))
{
alert ("Time is not in a valid format.");
return false;
}
return true;
}

function time_change(tmp)
{
if (isValidDate(document.saturn.date_txt.value) == true)
{
var jd_temp, zz, ff, alpha, aa, bb, cc, dd, ee;
var calendar_day, calendar_month, calendar_year;
var int_day, hours, minutes;

var tm_as_str, ut_hrs, ut_mns, frac_day;

var jd = julian_date();

tm_as_str = document.saturn.ut_h_m.value;
ut_hrs = eval(tm_as_str.substring(0,2));
ut_mns = eval(tm_as_str.substring(3,5));
frac_day = ut_hrs / 24.0 + ut_mns / 1440.0;

with (Math) {

jd_temp = jd + frac_day + tmp / 24.0 + 0.5;

zz = floor(jd_temp);
ff = jd_temp - zz;
alpha = floor((zz - 1867216.25) / 36524.25);
aa = zz + 1 + alpha - floor(alpha / 4);
bb = aa + 1524;
cc = floor((bb - 122.1) / 365.25);
dd = floor(365.25 * cc);
ee = floor((bb - dd) / 30.6001);
calendar_day = bb - dd - floor(30.6001 * ee) + ff;
calendar_month = ee;
if (ee < 13.5) calendar_month = ee - 1;
if (ee > 13.5) calendar_month = ee - 13;
calendar_year = cc;
if (calendar_month > 2.5) calendar_year = cc - 4716;
if (calendar_month < 2.5) calendar_year = cc - 4715;
int_day = floor(calendar_day);
hours = (calendar_day - int_day) * 24;
minutes = floor((hours - floor(hours)) * 60 + 0.5);
hours = floor(hours);
if (minutes > 59)
{minutes = 0; hours = hours + 1;}
if (calendar_month < 10) calendar_month = "0" + calendar_month;
if (int_day < 10) int_day = "0" + int_day;
if (hours < 10) hours = "0" + floor(hours);
if (minutes < 10) minutes = "0" + minutes;
}
document.saturn.date_txt.value = calendar_month + "/" + int_day + "/" + calendar_year;
document.saturn.ut_h_m.value = hours + ":" + minutes;
saturn();
return true;
}
else
{
return false;
}
}

function julian_date()
{
var dt_as_str, mm, dd, yy;
var yyy, mmm, a, b;

dt_as_str = document.saturn.date_txt.value;
mm = eval(dt_as_str.substring(0,2));
dd = eval(dt_as_str.substring(3,5));
yy = eval(dt_as_str.substring(6,10));

with (Math) {
var yyy=yy;
var mmm=mm;
if (mm < 3)
{
yyy = yy - 1;
mmm = mm + 12;
}
a = floor(yyy/100);
b = 2 - a + floor(a/4);

return floor(365.25*yyy) + floor(30.6001*(mmm+1)) + dd + 1720994.5 + b;
}
}

function isReflector()
{
if (isValidDate(document.saturn.date_txt.value) == true)
{
view_type = "reflector";
reset_flag = 1;
if (document.all)
{
document.all.direct.style.zIndex = 1;
document.all.inverted.style.zIndex = 20;
document.all.mirrored.style.zIndex = 1;
}
else
{
if (document.layers)
{
document.layers["direct"].zIndex = 1;
document.layers["inverted"].zIndex = 20;
document.layers["mirrored"].zIndex = 1;
}
else
{
if (document.getElementById)
{
document.getElementById("direct").style.zIndex = 1;
document.getElementById("inverted").style.zIndex = 20;
document.getElementById("mirrored").style.zIndex = 1;
}
}
}
saturn();
return true;
}
else
{
return false;
}
}

function isRefractor()
{
if (isValidDate(document.saturn.date_txt.value) == true)
{
view_type = "refractor";
reset_flag = 1;
if (document.all)
{
document.all.direct.style.zIndex = 1;
document.all.inverted.style.zIndex = 1;
document.all.mirrored.style.zIndex = 20;
}
else
{
if (document.layers)
{
document.layers["direct"].zIndex = 1;
document.layers["inverted"].zIndex = 1;
document.layers["mirrored"].zIndex = 20;
}
else
{
if (document.getElementById)
{
document.getElementById("direct").style.zIndex = 1;
document.getElementById("inverted").style.zIndex = 1;
document.getElementById("mirrored").style.zIndex = 20;
}
}
}
saturn();
return true;
}
else
{
return false;
}
}

function isBinocular()
{
if (isValidDate(document.saturn.date_txt.value) == true)
{
view_type = "binocular";
reset_flag = 1;
if (document.all)
{
document.all.direct.style.zIndex = 20;
document.all.inverted.style.zIndex = 1;
document.all.mirrored.style.zIndex = 1;
}
else
{
if (document.layers)
{
document.layers["direct"].zIndex = 20;
document.layers["inverted"].zIndex = 1;
document.layers["mirrored"].zIndex = 1;
}
else
{
if (document.getElementById)
{
document.getElementById("direct").style.zIndex = 20;
document.getElementById("inverted").style.zIndex = 1;
document.getElementById("mirrored").style.zIndex = 1;
}
}
}
saturn();
return true;
}
else
{
return false;
}
}

function saturn()
{

with (Math)
{
var dt = 65;
var p2 = 2 * PI;
var RAD = 180 / PI;
var scale_fact = 7.0537;

clear_rings();

var jd = julian_date();

var tm_as_str = document.saturn.ut_h_m.value;
var ut_hrs = eval(tm_as_str.substring(0,2));
var ut_mns = eval(tm_as_str.substring(3,5));
var frac_day = ut_hrs / 24.0 + ut_mns / 1440.0;
var temp = jd + frac_day + dt / 86400;

var T = (temp - 2415020.0) / 36525;
var T1 = T - floor(T);

var E0 = 0.01675;
var M0 = (358.47583 + 36000 * T1 - 0.95025 * T) / RAD;
var C0 = 2 * E0 * sin(M0) + 1.25 * E0 * E0 * sin(2 * M0);
var L0 = (99.697 + 36000 * T1 + 0.76892 * T) / RAD + C0;
var E8 = (23.452294 - 0.0130125 * T) / RAD;

var E6 = 0.05589;
var M6 = (175.46622 + 1080 * T1 + 141.55147 * T) / RAD;
var C6 = 2 * E6 * sin(M6) + 1.25 * E6 * E6 * sin(2 * M6);
var L6 = (266.564 + 1080 * T1 + 143.509884 * T) / RAD + C6;
var A6 = 9.554747;
var B6 = 2.49 / RAD * sin(L6 - (112.79 + 0.87 * T) / RAD);

L0 = proper_ang_rad(L0);
L6 = proper_ang_rad(L6);

var K = L0 - L6;
var D1 = sqrt(A6 * A6 + 1 - 2 * A6 * cos(K));
var P2 = sin(K) / D1;
var P2 = atan(P2 / sqrt(1 - P2 * P2));
var L3 = L6 - P2;
var B3 = B6 * A6 / D1;
var Q1 = sin(L3) * cos(E8) - sin(B3) * sin(E8) / cos(B3);
var Q2 = cos(L3)
var A4 = atan2(Q1,Q2);
var D4 = sin(B3) * cos(E8) + cos(B3) * sin(E8) * sin(L3);
var D4 = atan(D4 / sqrt(1 - D4 * D4));
var LT = D1 / (173 * 36525);

var I6 = 28.08 / RAD;
var N6 = (168.12 + 1.4 * T) / RAD;
var J6 = cos(I6) * cos(E8) - sin(I6) * sin(E8) * cos(N6);
J6 = atan(sqrt(1 - J6 * J6) / J6);
var D7 = cos(I6) * sin(E8) + sin(I6) * cos(E8) * cos(N6);
var N7 = atan(sin(I6) * sin(N6) / D7) + PI;
D7 = sin(I6) * cos(E8) + cos(I6) * sin(E8) * cos(N6);
var W6 = atan(sin(E8) * sin(N6) / D7);
var B6 = sin(J6) * cos(D4) * sin(A4 - N7) - cos(J6) * sin(D4);
B6 = atan(B6 / sqrt(1 - B6 * B6));
var U6 = cos(J6) * cos(D4) * sin(A4 - N7) + sin(J6) * sin(D4);
var U7 = cos(D4) * cos(A4 - N7);
U6 = atan2(U6,U7);
var X1 = 2.35;
var Y1 = X1 * sin(B6);
var X0 = 1.56;
var Y0 = X0 * sin(B6);

var pa = proper_ang(U6 * RAD);
var de = B6 * RAD;
var rings = abs(de);

var TA = T1 - LT;
var TB = T - LT;
var O2 = (187.76 + 9596160 * TA + 124.126763 * TB) / RAD;
var O3 = (355.32 + 6964920 * TA + 322.62375 * TB) / RAD;
var O4 = (191.71 + 4804200 * TA + 114.885173 * TB) / RAD;
var O5 = (101.37 + 2910600 * TA + 80.467853 * TB) / RAD;
var O6 = (271.66 + 824400 * TA + 225.475797 * TB) / RAD;
 
O2 = proper_ang_rad(O2 - N6 + W6);
O3 = proper_ang_rad(O3 - N6 + W6);
O4 = proper_ang_rad(O4 - N6 + W6);
O5 = proper_ang_rad(O5 - N6 + W6);
O6 = proper_ang_rad(O6 - N6 + W6);

var X2 = (4.1 * sin(O2 - U6)) * scale_fact;
var Y2 = (4.1 * sin(B6) * cos(O2 - U6)) * scale_fact;
var X3 = (5.08 * sin(O3 - U6)) * scale_fact;
var Y3 = (5.08 * sin(B6) * cos(O3 - U6)) * scale_fact;
var X4 = (6.51 * sin(O4 - U6)) * scale_fact;
var Y4 = (6.51 * sin(B6) * cos(O4 - U6)) * scale_fact;
var X5 = (9.09 * sin(O5 - U6)) * scale_fact;
var Y5 = (9.09 * sin(B6) * cos(O5 - U6)) * scale_fact;
var X6 = (21.1 * sin(O6 - U6)) * scale_fact;
var Y6 = (21.1 * sin(B6) * cos(O6 - U6)) * scale_fact;

var enceladus_ang = proper_ang_rad(O2 - U6 + PI);
var tethys_ang = proper_ang_rad(O3 - U6 + PI);
var dione_ang = proper_ang_rad(O4 - U6 + PI);
var rhea_ang = proper_ang_rad(O5 - U6 + PI);
var titan_ang = proper_ang_rad(O6 - U6 + PI);

var x_enceladus = - X2;
var y_enceladus = - Y2;
var enceladus_layer = 11;
if ((1.571 < enceladus_ang) && (enceladus_ang < 4.712)) enceladus_layer = 9;

var x_tethys = - X3;
var y_tethys = - Y3;
var tethys_layer = 11;
if ((1.571 < tethys_ang) && (tethys_ang < 4.712)) tethys_layer = 9;

var x_dione = - X4;
var y_dione = - Y4;
var dione_layer = 11;
if ((1.571 < dione_ang) && (dione_ang < 4.712)) dione_layer = 9;

var x_rhea = - X5;
var y_rhea = - Y5;
var rhea_layer = 11;
if ((1.571 < rhea_ang) && (rhea_ang < 4.712)) rhea_layer = 9;

var x_titan = - X6 * 0.95;
var y_titan = - Y6 * 0.95;
var titan_layer = 11;
if ((1.571 < titan_ang) && (titan_ang < 4.712)) titan_layer = 9;

if (rings < 0.5)
{
saturn_0_layer = 10;
}

if ((de > 0 && (view_type == "binocular" || view_type == "refractor")) || (de < 0 && view_type == "reflector"))
{
if ((rings >= 0.5) && (rings < 1.5))
{
saturn_1_n_layer = 10;
}
if ((rings >= 1.5) && (rings < 2.5))
{
saturn_2_n_layer = 10;
}
if ((rings >= 2.5) && (rings < 4.0))
{
saturn_3_n_layer = 10;
}
if ((rings >= 4.0) && (rings < 6.5))
{
saturn_5_n_layer = 10;
}
if ((rings >= 6.5) && (rings < 10.5))
{
saturn_8_n_layer = 10;
}
if ((rings >= 10.5) && (rings < 15.5))
{
saturn_13_n_layer = 10;
}
if ((rings >= 15.5) && (rings < 20.5))
{
saturn_18_n_layer = 10;
}
if ((rings >= 20.5) && (rings < 25.5))
{
saturn_23_n_layer = 10;
}
if ((rings >= 25.5) && (rings < 30))
{
saturn_28_n_layer = 10;
}
}
else
{
if ((rings >= 0.5) && (rings < 1.5))
{
saturn_1_s_layer = 10;
}
if ((rings >= 1.5) && (rings < 2.5))
{
saturn_2_s_layer = 10;
}
if ((rings >= 2.5) && (rings < 4.0))
{
saturn_3_s_layer = 10;
}
if ((rings >= 4.0) && (rings < 6.5))
{
saturn_5_s_layer = 10;
}
if ((rings >= 6.5) && (rings < 10.5))
{
saturn_8_s_layer = 10;
}
if ((rings >= 10.5) && (rings < 15.5))
{
saturn_13_s_layer = 10;
}
if ((rings >= 15.5) && (rings < 20.5))
{
saturn_18_s_layer = 10;
}
if ((rings >= 20.5) && (rings < 25.5))
{
saturn_23_s_layer = 10;
}
if ((rings >= 25.5) && (rings < 30))
{
saturn_28_s_layer = 10;
}
}

if (document.all)
{
document.all.saturn0.style.zIndex = saturn_0_layer;
document.all.saturn1n.style.zIndex = saturn_1_n_layer;
document.all.saturn2n.style.zIndex = saturn_2_n_layer;
document.all.saturn3n.style.zIndex = saturn_3_n_layer;
document.all.saturn5n.style.zIndex = saturn_5_n_layer;
document.all.saturn8n.style.zIndex = saturn_8_n_layer;
document.all.saturn13n.style.zIndex = saturn_13_n_layer;
document.all.saturn18n.style.zIndex = saturn_18_n_layer;
document.all.saturn23n.style.zIndex = saturn_23_n_layer;
document.all.saturn28n.style.zIndex = saturn_28_n_layer;
document.all.saturn1s.style.zIndex = saturn_1_s_layer;
document.all.saturn2s.style.zIndex = saturn_2_s_layer;
document.all.saturn3s.style.zIndex = saturn_3_s_layer;
document.all.saturn5s.style.zIndex = saturn_5_s_layer;
document.all.saturn8s.style.zIndex = saturn_8_s_layer;
document.all.saturn13s.style.zIndex = saturn_13_s_layer;
document.all.saturn18s.style.zIndex = saturn_18_s_layer;
document.all.saturn23s.style.zIndex = saturn_23_s_layer;
document.all.saturn28s.style.zIndex = saturn_28_s_layer;
}
else
{
if (document.layers)
{
document.layers["saturn0"].zIndex = saturn_0_layer;
document.layers["saturn1n"].zIndex = saturn_1_n_layer;
document.layers["saturn2n"].zIndex = saturn_2_n_layer;
document.layers["saturn3n"].zIndex = saturn_3_n_layer;
document.layers["saturn5n"].zIndex = saturn_5_n_layer;
document.layers["saturn8n"].zIndex = saturn_8_n_layer;
document.layers["saturn13n"].zIndex = saturn_13_n_layer;
document.layers["saturn18n"].zIndex = saturn_18_n_layer;
document.layers["saturn23n"].zIndex = saturn_23_n_layer;
document.layers["saturn28n"].zIndex = saturn_28_n_layer;
document.layers["saturn1s"].zIndex = saturn_1_s_layer;
document.layers["saturn2s"].zIndex = saturn_2_s_layer;
document.layers["saturn3s"].zIndex = saturn_3_s_layer;
document.layers["saturn5s"].zIndex = saturn_5_s_layer;
document.layers["saturn8s"].zIndex = saturn_8_s_layer;
document.layers["saturn13s"].zIndex = saturn_13_s_layer;
document.layers["saturn18s"].zIndex = saturn_18_s_layer;
document.layers["saturn23s"].zIndex = saturn_23_s_layer;
document.layers["saturn28s"].zIndex = saturn_28_s_layer;
}
else
{
if (document.getElementById)
{
document.getElementById("saturn0").style.zIndex = saturn_0_layer;
document.getElementById("saturn1n").style.zIndex = saturn_1_n_layer;
document.getElementById("saturn2n").style.zIndex = saturn_2_n_layer;
document.getElementById("saturn3n").style.zIndex = saturn_3_n_layer;
document.getElementById("saturn5n").style.zIndex = saturn_5_n_layer;
document.getElementById("saturn8n").style.zIndex = saturn_8_n_layer;
document.getElementById("saturn13n").style.zIndex = saturn_13_n_layer;
document.getElementById("saturn18n").style.zIndex = saturn_18_n_layer;
document.getElementById("saturn23n").style.zIndex = saturn_23_n_layer;
document.getElementById("saturn28n").style.zIndex = saturn_28_n_layer;
document.getElementById("saturn1s").style.zIndex = saturn_1_s_layer;
document.getElementById("saturn2s").style.zIndex = saturn_2_s_layer;
document.getElementById("saturn3s").style.zIndex = saturn_3_s_layer;
document.getElementById("saturn5s").style.zIndex = saturn_5_s_layer;
document.getElementById("saturn8s").style.zIndex = saturn_8_s_layer;
document.getElementById("saturn13s").style.zIndex = saturn_13_s_layer;
document.getElementById("saturn18s").style.zIndex = saturn_18_s_layer;
document.getElementById("saturn23s").style.zIndex = saturn_23_s_layer;
document.getElementById("saturn28s").style.zIndex = saturn_28_s_layer;
}
}
}

if (reset_flag == 0)
{
if (document.all)
{
document.all.chooseit.style.zIndex = 21;
}
else
{
if (document.layers)
{
document.layers["chooseit"].zIndex = 21;
}
else
{
if (document.getElementById)
{
document.getElementById("chooseit").style.zIndex = 21;
}
}
}
}
else
{
if (document.all)
{
document.all.chooseit.style.zIndex = 1;
}
else
{
if (document.layers)
{
document.layers["chooseit"].zIndex = 1;
}
else
{
if (document.getElementById)
{
document.getElementById("chooseit").style.zIndex = 1;
}
}
}
}

if (view_type == "reflector")
{
x_enceladus = 408 - x_enceladus - 3;
y_enceladus = 151 - y_enceladus - 1;
x_tethys = 408 - x_tethys - 3;
y_tethys = 151 - y_tethys - 1;
x_dione = 408 - x_dione - 3;
y_dione = 151 - y_dione - 1;
x_rhea = 408 - x_rhea - 3;
y_rhea = 151 - y_rhea - 1;
x_titan = 408 - x_titan - 3;
y_titan = 151 - y_titan - 1;

if (document.all)
{
document.all.moonenceladus.style.pixelLeft = x_enceladus;
document.all.moonenceladus.style.pixelTop = y_enceladus;
document.all.moonenceladus.style.zIndex = enceladus_layer;
document.all.moontethys.style.pixelLeft = x_tethys;
document.all.moontethys.style.pixelTop = y_tethys;
document.all.moontethys.style.zIndex = tethys_layer;
document.all.moondione.style.pixelLeft = x_dione;
document.all.moondione.style.pixelTop = y_dione;
document.all.moondione.style.zIndex = dione_layer;
document.all.moonrhea.style.pixelLeft = x_rhea;
document.all.moonrhea.style.pixelTop = y_rhea;
document.all.moonrhea.style.zIndex = rhea_layer;
document.all.moontitan.style.pixelLeft = x_titan;
document.all.moontitan.style.pixelTop = y_titan;
document.all.moontitan.style.zIndex = titan_layer;
}
else
{
if (document.layers)
{
document.layers["moonenceladus"].left = x_enceladus;
document.layers["moonenceladus"].top = y_enceladus;
document.layers["moonenceladus"].zIndex = enceladus_layer;
document.layers["moontethys"].left = x_tethys;
document.layers["moontethys"].top = y_tethys;
document.layers["moontethys"].zIndex = tethys_layer;
document.layers["moondione"].left = x_dione;
document.layers["moondione"].top = y_dione;
document.layers["moondione"].zIndex = dione_layer;
document.layers["moonrhea"].left = x_rhea;
document.layers["moonrhea"].top = y_rhea;
document.layers["moonrhea"].zIndex = rhea_layer;
document.layers["moontitan"].left = x_titan;
document.layers["moontitan"].top = y_titan;
document.layers["moontitan"].zIndex = titan_layer;
}
else
{
if (document.getElementById)
{
document.getElementById("moonenceladus").style.left = x_enceladus;
document.getElementById("moonenceladus").style.top = y_enceladus;
document.getElementById("moonenceladus").style.zIndex = enceladus_layer;
document.getElementById("moontethys").style.left = x_tethys;
document.getElementById("moontethys").style.top = y_tethys;
document.getElementById("moontethys").style.zIndex = tethys_layer;
document.getElementById("moondione").style.left = x_dione;
document.getElementById("moondione").style.top = y_dione;
document.getElementById("moondione").style.zIndex = dione_layer;
document.getElementById("moonrhea").style.left = x_rhea;
document.getElementById("moonrhea").style.top = y_rhea;
document.getElementById("moonrhea").style.zIndex = rhea_layer;
document.getElementById("moontitan").style.left = x_titan;
document.getElementById("moontitan").style.top = y_titan;
document.getElementById("moontitan").style.zIndex = titan_layer;
}
}
}
}

if (view_type == "refractor")
{
x_enceladus = 408 - x_enceladus - 3;
y_enceladus = 151 + y_enceladus - 1;
x_tethys = 408 - x_tethys - 3;
y_tethys = 151 + y_tethys - 1;
x_dione = 408 - x_dione - 3;
y_dione = 151 + y_dione - 1;
x_rhea = 408 - x_rhea - 3;
y_rhea = 151 + y_rhea - 1;
x_titan = 408 - x_titan - 3;
y_titan = 151 + y_titan - 1;

if (document.all)
{
document.all.moonenceladus.style.pixelLeft = x_enceladus;
document.all.moonenceladus.style.pixelTop = y_enceladus;
document.all.moonenceladus.style.zIndex = enceladus_layer;
document.all.moontethys.style.pixelLeft = x_tethys;
document.all.moontethys.style.pixelTop = y_tethys;
document.all.moontethys.style.zIndex = tethys_layer;
document.all.moondione.style.pixelLeft = x_dione;
document.all.moondione.style.pixelTop = y_dione;
document.all.moondione.style.zIndex = dione_layer;
document.all.moonrhea.style.pixelLeft = x_rhea;
document.all.moonrhea.style.pixelTop = y_rhea;
document.all.moonrhea.style.zIndex = rhea_layer;
document.all.moontitan.style.pixelLeft = x_titan;
document.all.moontitan.style.pixelTop = y_titan;
document.all.moontitan.style.zIndex = titan_layer;
}
else
{
if (document.layers)
{
document.layers["moonenceladus"].left = x_enceladus;
document.layers["moonenceladus"].top = y_enceladus;
document.layers["moonenceladus"].zIndex = enceladus_layer;
document.layers["moontethys"].left = x_tethys;
document.layers["moontethys"].top = y_tethys;
document.layers["moontethys"].zIndex = tethys_layer;
document.layers["moondione"].left = x_dione;
document.layers["moondione"].top = y_dione;
document.layers["moondione"].zIndex = dione_layer;
document.layers["moonrhea"].left = x_rhea;
document.layers["moonrhea"].top = y_rhea;
document.layers["moonrhea"].zIndex = rhea_layer;
document.layers["moontitan"].left = x_titan;
document.layers["moontitan"].top = y_titan;
document.layers["moontitan"].zIndex = titan_layer;
}
else
{
if (document.getElementById)
{
document.getElementById("moonenceladus").style.left = x_enceladus;
document.getElementById("moonenceladus").style.top = y_enceladus;
document.getElementById("moonenceladus").style.zIndex = enceladus_layer;
document.getElementById("moontethys").style.left = x_tethys;
document.getElementById("moontethys").style.top = y_tethys;
document.getElementById("moontethys").style.zIndex = tethys_layer;
document.getElementById("moondione").style.left = x_dione;
document.getElementById("moondione").style.top = y_dione;
document.getElementById("moondione").style.zIndex = dione_layer;
document.getElementById("moonrhea").style.left = x_rhea;
document.getElementById("moonrhea").style.top = y_rhea;
document.getElementById("moonrhea").style.zIndex = rhea_layer;
document.getElementById("moontitan").style.left = x_titan;
document.getElementById("moontitan").style.top = y_titan;
document.getElementById("moontitan").style.zIndex = titan_layer;
}
}
}
}

if (view_type == "binocular")
{
x_enceladus = 408 + x_enceladus - 3;
y_enceladus = 151 + y_enceladus - 1;
x_tethys = 408 + x_tethys - 3;
y_tethys = 151 + y_tethys - 1;
x_dione = 408 + x_dione - 3;
y_dione = 151 + y_dione - 1;
x_rhea = 408 + x_rhea - 3;
y_rhea = 151 + y_rhea - 1;
x_titan = 408 + x_titan - 3;
y_titan = 151 + y_titan - 1;

if (document.all)
{
document.all.moonenceladus.style.pixelLeft = x_enceladus;
document.all.moonenceladus.style.pixelTop = y_enceladus;
document.all.moonenceladus.style.zIndex = enceladus_layer;
document.all.moontethys.style.pixelLeft = x_tethys;
document.all.moontethys.style.pixelTop = y_tethys;
document.all.moontethys.style.zIndex = tethys_layer;
document.all.moondione.style.pixelLeft = x_dione;
document.all.moondione.style.pixelTop = y_dione;
document.all.moondione.style.zIndex = dione_layer;
document.all.moonrhea.style.pixelLeft = x_rhea;
document.all.moonrhea.style.pixelTop = y_rhea;
document.all.moonrhea.style.zIndex = rhea_layer;
document.all.moontitan.style.pixelLeft = x_titan;
document.all.moontitan.style.pixelTop = y_titan;
document.all.moontitan.style.zIndex = titan_layer;
}
else
{
if (document.layers)
{
document.layers["moonenceladus"].left = x_enceladus;
document.layers["moonenceladus"].top = y_enceladus;
document.layers["moonenceladus"].zIndex = enceladus_layer;
document.layers["moontethys"].left = x_tethys;
document.layers["moontethys"].top = y_tethys;
document.layers["moontethys"].zIndex = tethys_layer;
document.layers["moondione"].left = x_dione;
document.layers["moondione"].top = y_dione;
document.layers["moondione"].zIndex = dione_layer;
document.layers["moonrhea"].left = x_rhea;
document.layers["moonrhea"].top = y_rhea;
document.layers["moonrhea"].zIndex = rhea_layer;
document.layers["moontitan"].left = x_titan;
document.layers["moontitan"].top = y_titan;
document.layers["moontitan"].zIndex = titan_layer;
}
else
{
if (document.getElementById)
{
document.getElementById("moonenceladus").style.left = x_enceladus;
document.getElementById("moonenceladus").style.top = y_enceladus;
document.getElementById("moonenceladus").style.zIndex = enceladus_layer;
document.getElementById("moontethys").style.left = x_tethys;
document.getElementById("moontethys").style.top = y_tethys;
document.getElementById("moontethys").style.zIndex = tethys_layer;
document.getElementById("moondione").style.left = x_dione;
document.getElementById("moondione").style.top = y_dione;
document.getElementById("moondione").style.zIndex = dione_layer;
document.getElementById("moonrhea").style.left = x_rhea;
document.getElementById("moonrhea").style.top = y_rhea;
document.getElementById("moonrhea").style.zIndex = rhea_layer;
document.getElementById("moontitan").style.left = x_titan;
document.getElementById("moontitan").style.top = y_titan;
document.getElementById("moontitan").style.zIndex = titan_layer;
}
}
}
}

}
}