To find altitude and azimuth of a star, enter the following information: star declination (δ), local hour angle (tm) and reckoned latitude (φc). Each value is entered into two fields, degrees and minutes. Degrees for declination and latitude are entered in the range of 0 ° to 89 °, and for the hour angle in the range from 0 ° to 179 °, minutes from 00.0` to 59.9`, do not forget to select the appropriate name for the values in the drop-down lists​​.

https://github.com/AndreiMasalykin/CelestialNavCalc