What meridian is east of 15 degrees east?

Answer 1

That's like asking "What is the next distance farther than 47.3 miles ?",

or "What is the next heavier weight after 1851/4 pounds ?"

There is no minimum-size "step". The "next" one can be as close to 15 degrees as

you want it to be. And no matter how close it is, somebody can always come along

and slip in another one that's even closer.

There is no standard set of "lines" of latitude or longitude. That's definitely the

biggest, most universal misconception we see in this category of questions.

And another thing! . . . Since the Earth is a sphere (ball-shaped), you can

start at 15 degrees east. travel east, and wind up at ANY meridian you want.

The best answer to the question is: They ALL are.