Ra

n 1: an intensely radioactive metallic element that occurs in

minute amounts in uranium ores [syn: {radium}, {Ra}, {atomic

number 88}]

2: (astronomy) the angular distance eastward along the

celestial equator from the vernal equinox to the

intersection of the hour circle that passes through the

body; expressed in hours and minutes and second; used with

declination to specify positions on the celestial sphere;

"one hour of right ascension equals fifteen degrees" [syn:

{right ascension}, {RA}, {celestial longitude}]

3: ancient hawk-headed sun god; a universal creator [syn: {Ra},

{Re}]