altaz2hadec: Convert horizon (Alt-Az) coordinates to hour angle and...
In astrolibR: Astronomy Users Library
Description
Usage
Arguments
Details
Value
Author(s)
See Also
Examples
Description
Convert horizon (Alt-Az) coordinates to hour angle and declination
Usage
1
altaz2hadec(alt,az,lat)
Arguments
alt
local apparent altitude, in degrees, scalar or vector
az
local apparent altitude, in degrees, scalar or vector, measured east of north
lat
local geodetic latitude, in degrees, scalar or vector
Details
For inputs, if you have measured azimuth west-of-south
(like the book MEEUS does), convert it to east of north via: az = (az + 180) mod 360
For outputs, the hour angle is the
time that right ascension of 0 hours crosses the local meridian.
Value
ha
local apparent hour angle, in degrees
dec
local apparent declination, in degrees
Author(s)
Written by Chris O'Dell Univ. of Wisconsin-Madison May 2002
R adaptation by Arnab Chakraborty June 2013
See Also
Examples
1
altaz2hadec(59.0861,133.3081,41.3)
Example output
$ha
[1] 336.9155
$dec
[1] 17.54789
astrolibR documentation built on May 2, 2019, 3:26 a.m.
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Description Usage Arguments Details Value Author(s) See Also Examples
Description
Convert horizon (Alt-Az) coordinates to hour angle and declination
Usage
1 | altaz2hadec(alt,az,lat)
|
Arguments
alt |
local apparent altitude, in degrees, scalar or vector |
az |
local apparent altitude, in degrees, scalar or vector, measured east of north |
lat |
local geodetic latitude, in degrees, scalar or vector |
Details
For inputs, if you have measured azimuth west-of-south (like the book MEEUS does), convert it to east of north via: az = (az + 180) mod 360 For outputs, the hour angle is the time that right ascension of 0 hours crosses the local meridian.
Value
ha |
local apparent hour angle, in degrees |
dec |
local apparent declination, in degrees |
Author(s)
Written by Chris O'Dell Univ. of Wisconsin-Madison May 2002
R adaptation by Arnab Chakraborty June 2013
See Also
Examples
1 | altaz2hadec(59.0861,133.3081,41.3)
|
Example output
$ha
[1] 336.9155
$dec
[1] 17.54789
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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