24A One of the imaginary lines joining the north and south poles at right angles to the equator. 8 letters. I was sure this was LATITUDE but it doesn't fit with 21 Down, Person active in political...
3 D (3 letters) Finial Dagoba --We know that Finial is at the apex of a roof, and Dagoba is the pointed bit at the top of a sphere, but what are they otherwise? First letter is possibly "G"