Date, Time, and Angle Functions

The functions listed below are useful for working with coordinates and time. Some functions compute quantities, such as Julian Date whereas most perform conversions between date, time, and angle in various formats, such as converting DMS to degrees, and vice versa. Some classes such as CImage include several similar methods.

Date Functions

CalcAirmass	Calculates the airmass from celestial coordinates and time.
CalcJD	Calculates the standard Julian Date
CalcHJD	Calculates the heliocentric Julian Date which corrects the Julian Date for light travel time to the Sun.
CalcMJD	Calculates the Modified Julian Date which drops the most significant digits of the Julian Date.
FormatDate	Formats year, month, and day to a string.
FormatYmdStr	Formats a date string in containing various combinations of year, month, and day to a proper date string.
JdToDateTime	Converts a decimal Julian Date to two strings, one containing the day, year, and month, and the other containing hours, minutes, and seconds.
ParseJD	Converts a decimal Julian Date to six numbers for the day, year, month, hours, minutes, and seconds.
ParseYmd	Converts a date string containing year, month, and day to year, month, and day.

Time Functions

CalcLST	Calculates the local sidereal time from coordinates and location on Earth.
DateToYmd	Converts a date string to year, month, and day.
DayOfWeek	Converts the year, month, and day to the day of week.
FormatHmsStr	Formats a time string in containing various combinations of hours, minutes, and seconds to a proper time string.
FormatTime	Formats hours, minutes, and seconds to a proper time string.
JdToDateTime	Converts a decimal Julian Date to two strings, one containing the day, year, and month, and the other containing hours, minutes, and seconds.
ParseJD	Converts a decimal Julian Date to six numbers for the day, year, month, hours, minutes, and seconds.
HmsToHr	Converts a time string containing hours, minutes, and seconds to decimal hours.
HrToHms	Converts decimal hours to a time string containing hours, minutes, and seconds.
ParseHms	Converts a time string to hours, minutes, and seconds.
ParseHours	Converts decimal hours to hours, minutes, and seconds.

Angle Functions

CalcAirmass	Calculates the airmass from coordinates and time.
CalcSphAngle	Calculates the spherical angle between coordinates on the sky.
DegToDms	Converts decimal degrees to a string containing degrees, minutes, and seconds.
DegToHms	Converts decimal degrees to a string containing hours, minutes, and seconds.
DmsToDeg	Converts an angle string containing degrees, minutes, and seconds to decimal degrees.
FormatAngle	Converts time in degrees, minutes, and seconds to a string.
FormatDmsStr	Formats an angle string containing various combinations of degrees, minutes, and seconds to a proper angle string.
HmsToDeg	Converts a time string containing hours, minutes, and seconds to decimal degrees.
HmsToHr	Converts a time string containing hours, minutes, and seconds to decimal hours.
HrToHms	Converts decimal hours to a time string containing hours, minutes, and seconds.
ParseDegrees	Converts a decimal degrees 3 numbers for hours, minutes, and seconds.
ParseDms	Converts a degrees string to degrees, minutes, and seconds.
ParseHms	Converts a time string to hours, minutes, and seconds.
ParseHours	Converts decimal hours to hours, minutes, and seconds.

Date Functions

Time Functions

Angle Functions

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