The Doodle commemorates October's last Quarter moon-- better known as a half moon because of its half-full appearance -- ...

Google's latest Doodle celebrates the third quarter ... first quarter, waxing gibbous, full moon, waning gibbous, third quarter and waning crescent. As the moon orbits Earth, the sun illuminates ...

waxing gibbous, full Moon, waning gibbous, third quarter and finally waning crescent. This cycle repeats once every 29.5 days. Earth's only natural satellite is simply called ‘the Moon ...