XMM-Newton Science Analysis System


selectlib (selectlib-4.77) [xmmsas_20230412_1735-21.0.0]

Angles

Angles can be regarded as ordinary real numbers in units of radians. In addition angles may be expressed in terms of hours, minutes, and second of arc or time (e.g. for Right Ascension, Declination):

format	comment	evaluates to	example
(+|-)xxdxxmxx[.xxx]s	degrees + minutes and seconds of arc	angle in radians	-45d23m59.9s
xxhxxmxx[.xxx]s	hours + minutes and seconds of time	angle in radians	23h59m24.1s

x stands for a single decimal digit, d, h, m, s are literal characters and square brackets denote optional items. The number of shown digits after the decimal point is not significant.