I need to use the sunrise equation but one of the variables is the sun declination. On the other hand, I have the values for solar elevation angle that I need. Are they the same thing?
Elevation and Declination are from different co-ordinate systems, so solar elevation is given in Alt/Az co-ordinates and refers to the elevation above the local horizon. Sun declination is measured in RA/Dec co-ordinates (which is an equatorial co-ordinate system) and measures the Sun's inclination above or below the equator on the celestial sphere.