radians – maravelias.info

DS9 refuses radians as input

grigoris April 11, 2010 June 25, 2015

At the region file help page of ds9 we read that we can define position arguments in a region file by placing the numbers along with the right character, e.g. 17.845d for degrees, 16.234p for pixels. Even though that radians are stated to be working (by placing the r character, …

Astronomy

Sexagesimal and radian to degree conversion

grigoris March 23, 2010 June 24, 2015

A. If you want to convert sexagesimal numbers (RA=hh:mm:ss.s Dec=±dd:mm:ss) to degrees then use these relations: RA>deg: 15 x (hh + mm/60 + ss.s/3600) Dec>deg: ±dd ± (mm/60 + ss/3600) These relations are pretty easy to remember since > 1 hour the sky rotates 15 degrees (360degrees in 24 hours) …

Astronomy