Why is the crescent moon sometimes lit on the bottom?

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

What is a waning crescent moon?

Get ready for the final full moon of 2023 – but wrap up!

Sarah Cooper (@sarah_cooper_smith)

amateur observing - Why can I see sometimes a horizontal half moon instead of a vertical one? - Astronomy Stack Exchange

Understanding Astronomy: The Moon and Eclipses

Eli5 Moon looks different in each hemisphere? : r/explainlikeimfive

Replying to @thewrenchslinger

The Moon, our neighbour in space (for youth)

Why does the crescent moon seem to have a sharp line between light

Waxing Crescent Moon