CalcLST

The CalcLST function returns the Local Sidereal Time for a date and time (UT or GMT) and a longitude. To get the Greenwich Sidereal Time, use a longitude of 0.

Syntax

dLST = CalcLST( sDate, sTime, sLongitude )

• sDate is a string specifying YMD (e.g., "2007,05,24").
• sTime is a string specifying the UT time (e.g., "18:24:41.5").
• sLongitude is a string giving the longitude, in degrees (e.g., "112 24 46.88"). West longitude is positive.
• dLST is the sidereal time, in decimal hours (e.g., 6.424468).

Remarks

This function returns the Local Sidereal Time in decimal hours. To convert to a time string, use HrToHMS..

The date, time, and longitude values may use any number of commonly use field delimiters. Some examples are shown below:

     sDate:      "2007 05 24" "2007-05-24" "2007/05/24" "2007, 05, 24"

     sTime:      "18 24 41.5" "18:24:41.5" "18h24m41.5s" "18,24,41.5"

     sLongitude:      "112 24 46.88"      "112:24:46.88"      "112d24m46.88s"      "112,24,46.88"

Example

The following script calculates the local sidereal time for a date, time, and longitude.

Related Topics

HrToHms, CalcSphAngle