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measures.posangle - Function

	Package	general
	Module	measures
	Tool	measures

get position angle of two directions

Synopsis
posangle(m1, m2)

Arguments

m1	in	direction of source
		Allowed:	direction measure
m2	in	direction of other source
		Allowed:	direction measure

Returns
position angle as angle quantity

Description
posangle will give the position angle from a direction to another. I.e. the angle in a direction between the direction to the North pose and the other direction.

Example

- a:=dm.direction('j2000','0deg','70deg');
- b:=dm.direction('j2000','0deg','80deg'); 
- dm.posangle(a,b)
[value=-0, unit=deg] 
- dm.separation(a,b)
[value=10, unit=deg] 
- tim := dm.epoch('utc','today')			# set the time
- dm.doframe(tim)
T 
- pos := dm.observatory('ATCA')			# set where
- dm.doframe(pos)
T 
- dm.posangle(a,b)
[value=7.99647705, unit=deg]