no there is not a second season
sources:
wikipedia
i dont think so
The series consists of 25 episodes and one OVA.
moon phase
There is an extra season in the manga.
no, the anime has now only 5 seasons, but there will be a new anime called the silver chrystal this year. it wont be the season 6 , but it will be more manga like.
a 2nd quarter moon is a phase of the moon and the moon goes through 4 phases.
Second day of the New Moon.
Sailor Moon uses the Moon Scepter (Cutie Moon Rod in the Japanese) in the second arc of the Sailor Moon anime and manga.
The second season is called Sailor Moon R. It ran from episode 47 to episode 89 in the original Japanese run.
They are mentioning there will be one but at the moment there is none. All we can do is hope!
first quarter of the moon is second phase of the moon. it means that the shape of the moon is growing to the waxing gibbous.
Season 3 Episode 111