How many degrees longitude is Cassiopeia?

Answer 1

The system of longitude and latitude is designed and used for the purpose of

locating points on the surface of the Earth. These coordinates don't refer to

celestial (sky) objects. There's a whole separate coordinate system applied

to the sky, and there's no constant relationship between that one and the

surface coordinates.

In celestial coordinates, Cassiopeia occupies the range of Right Ascension between

about 22Hr 57Min and 3Hr 37Min, and the range of declination between about 40.7° and 77.55°.

Where those coordinates appear in your sky depends on the date and your location.

Answer 2

Cassiopeia is a constellation in the celestial sphere, so it does not have a specific longitude measured in degrees. Its position is determined by right ascension, which is similar to longitude but specific to the celestial sphere.