问题描述
我想根据this converter 到火星太阳经度转换器的地球日期，将地球上的当前日期转换为火星上的当前日期。 代码计算火星当前日期的方式应该是正确的，因此，如果有人知道我的错误以及如何提供帮助，请回答我。
JS：
function CheckGivenYear(){
let leap; // leap year ? (0==no,1==yes) (returned value)
const val = val.getFullYear();
// check if it is a leap year
/* a year is a leap year if it is a multiple of 4 but not of 100,or if it is a multiple of 400 */
if ((val % 4 == 0 && val % 100 != 0) || val % 400 == 0) {
leap = 1;
} else {
leap = 0; // not a leap year
}
return leap;
}
function Convert2Julian() {
let currentDate = new Date(),day = currentDate.getDate(),month = currentDate.getMonth() + 1,year = currentDate.getFullYear();
let leap; // leap year ? (0==no,1==yes)
let i;
let ref_year = 1968;
let ref_jDate = 2.4398565e6; // Julian date for 01/01/1968 00:00:00
let eDays = new Array(0,31,59,90,120,151,181,212,243,273,304,334);
// eDays = number of elapsed days during prevIoUs months of same year
let nDay = 0.0; // number of days
// compute number of days due to years
if (year > ref_year) {
for (i = ref_year; i < year; i++) {
nDay = nDay + 365.0;
if ((i % 4 == 0 && i % 100 != 0) || i % 400 == 0) {
// leap year
nDay++;
}
}
} else {
for (i = year; i < ref_year; i++) {
nDay = nDay - 365.0;
if ((i % 4 == 0 && i % 100 != 0) || i % 400 == 0) {
// leap year
nDay--;
}
}
}
leap = CheckGivenYear();
nDay = nDay + eDays[month - 1];
//alert(nDay)
//add 1 if year is leap and month >=3
if (leap == 1 && month >= 3) {
nDay = nDay + 1;
}
// add reference year offset and day
//jDate=ref_jDate+nDay+day;
let jDate = nDay * 1.0 + day * 1.0 + ref_jDate * 1.0 - 1.0;
return jDate;
}
function Convert2Ls() {
// Convert a Julian date to corresponding "sol" and "Ls"
let jDate;
let sol;
let ls;
let martianYear;
let martianMonth;
let jDate_ref = 2.442765667e6; // 19/12/1975 4:00:00,such that Ls=0
// jDate_ref is also the beginning of Martian Year "12"
let martianYear_ref = 12;
let earthDay = 86400.0;
let marsDay = 88775.245;
let marsYear = 668.6; // number of sols in a martian year
// Start by converting given date to Julian date
jDate = Convert2Julian();
// Convert julian days to sol date
//jDate = document.julian.value;
sol = ((jDate - jDate_ref) * earthDay) / marsDay;
martianYear = martianYear_ref;
// Compute Martian Year #,along with sol value
// sol being computed modulo the number of sols in a martian year
while (sol >= marsYear) {
sol = sol - marsYear;
martianYear = martianYear + 1;
}
while (sol < 0.0) {
sol = sol + marsYear;
martianYear = martianYear - 1;
}
// convert sol number to Ls
ls = Sol2Ls(sol);
// KNowing Ls compute martian month
martianMonth = 1 + Math.floor(ls / 30);
ls = Math.round(ls * 10) / 10;
sol = 1 + Math.floor(sol);
//display value with a maximum of 2 decimal digits
//document.martianYear.value = martianYear;
//document.calendar.martianMonth.value = martianMonth;
//document.calendar.ls.value = Math.round(ls * 10) / 10;
//document.calendar.sol.value=Math.round(sol*10)/10;
//document.calendar.sol.value = 1 + Math.floor(sol);
}
function Sol2Ls(sol) {
var sol;
let ls;
let year_day = 668.6; // number of sols in a martian year
let peri_day = 485.35; // perihelion date
let e_ellip = 0.0934; // orbital ecentricity
let timeperi = 1.90258341759902; // 2*Pi*(1-Ls(perihelion)/360); Ls(perihelion)=250.99
let rad2deg = 180 / Math.PI;
let i;
let zz,zanom,zdx = 10;
let xref,zx0,zteta;
// xref: mean anomaly,zx0: eccentric anomaly,zteta: true anomaly
zz = (sol - peri_day) / year_day;
zanom = 2 * Math.PI * (zz - Math.round(zz));
xref = Math.abs(zanom);
// Solve Kepler equation zx0 - e *sin(zx0) = xref
// Using Newton iterations
zx0 = xref + e_ellip * Math.sin(xref);
do {
zdx =
-(zx0 - e_ellip * Math.sin(zx0) - xref) / (1 - e_ellip * Math.cos(zx0));
zx0 = zx0 + zdx;
} while (zdx > 1e-7);
if (zanom < 0) zx0 = -zx0;
// Compute true anomaly zteta,Now that eccentric anomaly zx0 is kNown
zteta =
2 * Math.atan(Math.sqrt((1 + e_ellip) / (1 - e_ellip)) * Math.tan(zx0 / 2));
// compute Ls
ls = zteta - timeperi;
if (ls < 0) ls = ls + 2 * Math.PI;
if (ls > 2 * Math.PI) ls = ls - 2 * Math.PI;
// convert Ls into degrees
ls = rad2deg * ls;
return ls;
}
解决方法
用于火星计时和地球-火星日期/时间转换的Javascript日期对象。