utilitiesΒΆ
This submodule provides utility constants and functions for working with star data in GIANT.
Most of these utilities are focused on conversions of either units or of representations (ie a bearing to a unit vector) with the exception of applying proper motion and computing the distance between 2 bearings. For more details on what is contained refer to the following summary tables and the documentation for each constant/function.
Function
This function adjusts the right ascension and declination of stars to a new time. |
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This function converts a python datetime objects to the number of SI years since the MJD Epoch of November 17, 1858. |
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This function computes the great-circle angular distance in units of radians between ra/dec pairs. |
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This utility converts (a) right ascension and declination pair(s) expressed in units of radians into (an) unit vector(s). |
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This function converts a python timedelta object to a fractional number of SI years. |
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This function converts a unit vector(s) into a right ascension/declination bearing(s). |
Constants
This constant converts from units of degrees to units of radians through multiplication. |
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This constant converts from units of radians to units of degrees through multiplication. |
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This constant converts from units of degrees to units of milli-arc-seconds through multiplication. |
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This constant converts from units of milli-arc-seconds to units of degrees through multiplication. |
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This constant converts from units of radians to units of milli-arc-seconds through multiplication. |
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This constant converts from units of milli-arc-seconds to units of radians through multiplication. |
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This constant converts from units of parsecs to units of kilometers through multiplication. |
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The average distance of stars from the UCAC4 catalogue in kilometers. |
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This constant provides the number of SI days in a SI year. |
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This constant provides the number of SI seconds in a SI day. |
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This constant provides the standard modified Julian date epoch, November 17, 1858, as a datetime |