Question

While the earth rotates, how many longitudes face the sun daily?

Answer 1

Heya , Here's is your answer
 Since the Earth rotates once a day, during every 24hour period every longitude on Earth will face the Sun at some point.
Hope it works out for you.

Answer 2

There is no count of lines of longitudes. It’s possible to have as many as you care to draw. So if they are (say) at 5 degree intervals, there will be 72 of them. If at one degree intervals, there will be 360 and so on.