Is This Petavius?

[virtualpilot45]

One crater kept catching my eye on Tuesday, and after consulting some moon maps I believe it's Petavius, could someone confirm this? Thanks in advance!

[Dave]

Definitely Not Petavius as that would be closer to the limb.

If you mean the big one, that's Janssen.

[virtualpilot45]

Thanks! Better rename my photos

What's a limb when the moon is concerned?

[Pete Presland]

The circular edge of the disc itself is called the limb, and the points where the limb and terminator join (roughly at the lunar poles) are the cusps.

There are usually two parts to the limb - the illuminated portion is called the bright limb, whilst the less obvious portion which is not in sunlight is called the dark limb.

[virtualpilot45]

That explains a lot of stuff I've read elsewhere here, thanks