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### Presenting / printing Right Ascension and Declination values

Are there any standards or established practices on how to write / represent Right Ascension (RA) and Declination (DEC) values in the sexagesimal format?I have seen all of the following. E.g. for RA:02 03 04 (assumed to mean 2 hours, 3 hourly minutes and 4 hourly seconds)2 3 4 (same as above)2h 3m 4s (same as above)2d 3' 6" (assumed to mean 2 degrees, 3 degree minutes and 4 degree seconds)2d 3m 6s (same as above)15.33 (assumed to mean 15.33 degrees)9.5H (assumed to mean 9 hours, 30 hourly minutes and zero hourly seconds)8d 3.5 (assumed to mean ...Read more

### declination - an exercise from Spherical Astronomy by Smart

I want to solve this exercise from Spherical Astronomy by Smart:Prove that, in latitude 45°, the interval between the moment at which a star's azimuth is 90° east and the moment of setting is constant.I can't understand it, it says prove that it is constant for a star, or it is constant for every star with different declinations?Thanks....Read more