Right Ascension to Degrees Converter

How it is calculated

The tool turns the three fields into a single number of hours and multiplies by 15: degrees = 15 × (h + m ÷ 60 + s ÷ 3600). Here h is hours, m is minutes of time and s is seconds of time. The factor 15 is 360° divided by 24 hours. Minutes and seconds may be left empty and are then treated as 0; hours are required. Negative values give no result. The engine does not wrap or limit the input, so 25 hours and 75 minutes simply give 393.75°, beyond a full circle. The answer is shown with two decimals and a degree sign.

Common mistakes

• Treating the minutes and seconds as arcminutes and arcseconds. In right ascension they are minutes and seconds of time, so one minute is 15 arcminutes, not 1.
• Typing a declination (for example +41° 16′) into these fields. Declination is already in degrees and needs no ×15 conversion.
• Entering a decimal-hour value in the hours field and then also filling minutes. Put 6.75 in hours with the others empty, or use 6 h 45 m, not both.
• Typing a negative RA to mean west or before zero. Right ascension runs 0 to 24 h and the tool returns nothing for negative values; add 24 h first.
• Expecting values over 24 h to wrap back into 0°–360°. The tool does not wrap them.