If two points differing by 1° of latitude and of the same longitude is 110 km apart on the earth, then two astronomical positions on the moon is about

On Earth:
1° latitude=110km
The distance per degree is proportional to the radius of the body.
Earth radius ≈ 6370 km
Moon radius ≈ 1740 km
Therefore,
1°Moon
=110*1740/6370
=30.1km
So, two astronomical positions on the Moon differing by 1° of latitude are about 30 km apart.