gal2obs

Converts from Galactic coordinates (longitude, latitude) to observed coordinates (Altitude, Zenith angle). Altitude angle is also printed for those who prefer 'Altitude' over 'Zenith angle'. The 'apparent' Galactic longitude,latitude coordinates (resulting from atmospheric affects on the light being observed) are also provided.

Options

REQUIRED OPTIONS

Long form	short	Description
--longitude	-X	Observer longitude (degrees, East-positive)
--latitude	-Y	Observer latitude (degrees)
--glon	-L	Galactic longitude (degrees)
--glat	-B	Galactic latitude (degrees)

ADDITIONAL OPTIONS:

Long form	Short	Description
--help,	-h	Prints help text
--juliandate	-j	Julian Date for query (default is current time)
--elevation	-e	Observer elevation (meters above sea-level, default=0.000000)
--humidity	-r	Observer's relative humidity (0-1, default=0.000000)
--pressure	-p	Observer's atmospheric pressure (hPa, default=1013.250000)
--temperature	-t	Observer's temperature (degrees Celsius, default=15.050000)
--wavelength	-w	Wavelength of light being observed (micrometers, default=0.5)
--dut1	-d	UT1-UTC (default=0)
--xpolar	-x	x-polar motion (default=0, best to leave alone)
--ypolar	-y	y-polar motion (default=0, best to leave alone)

Example

The following is an example for getting the observed position of the Crab nebula as observed in Times Square in New York City:
Input

gal2obs -L 184.5518 -B -5.7904 -X -73.9851 -Y 40.7589

or

gal2obs --glon 184.5518 --glat -5.7904 --longitude -73.9851 --latitude 40.7589

Output

**********************************************
* Results of GALACTIC -> Observed conversion *
**********************************************
Observed Coordinates (output)
    Azimuth        : 272.458116 degrees
    Zenith         : +57.793155 degrees
    Altitude       : +32.206845 degrees
Galactic Coordinates (input)
    Gal. Longitude : 184.551800 degrees
    Gal. Latitude  : -5.790400 degrees
    Julian Date    : 2457570.344873
Apparent Galactic Coordinates
    Gal. Longitude : 184.549139
    Gal. Latitude  : -5.740064
Observer Info
    Longitude      : -73.985100 deg
    Latitude       : +40.758900 deg
    Elevation      : 0.000000 meters
    Pressure       : 1013.250000 hPa
    Temperature    : 15.050000 Celsius
    Relative Humid.: 0.000000