Why is the crescent moon sometimes lit on the bottom?

Moon Tilt Illusion - The Flat Earth Wiki

The Moon Phases Explained (Diagram Included)

What is meant by “declination” of the moon? - Quora

The Crescent Moon: What Causes It to Change Tilt and Direction?

c.tadst.com/gfx/600x337/moon-earthshine-venus-morn

Bottom Lit Moon

Part 1: Lunar Phases Imaging the Universe - The University of Iowa

How to observe a crescent Moon - BBC Sky at Night Magazine

Here's when you can see the moon in the Da Vinci glow

View the Thin Crescent of Venus - Sky & Telescope - Sky & Telescope

Why does the crescent moon look like it's lying on its side in the south, and on its axis in the north? - Quora

The Crescent Moon: What Causes It to Change Tilt and Direction?

Why Is The Moon Crescent?

Waxing Crescent Moon