Here's why:

* Longitude is a geographic coordinate: It refers to a location on Earth's surface, measured in degrees east or west of the Prime Meridian.

* Constellations are celestial objects: They are groups of stars that appear close together in the sky from our perspective on Earth.

What you can use to describe the location of Corvus:

* Right Ascension (RA): This is the celestial equivalent of longitude, measured in hours, minutes, and seconds along the celestial equator. Corvus has an approximate right ascension of 12 hours.

* Declination (Dec): This is the celestial equivalent of latitude, measured in degrees north or south of the celestial equator. Corvus has a declination of approximately -17 degrees.

Therefore, instead of asking for the longitude of Corvus, you can ask for its right ascension and declination.