Witches and Sandwiches

Good books for reference on Esbats:
Enchanted by Titania Hardie
Teen Witch (nope, I'm not making this up) by Silver Ravenwolf

Here are a couple of useful links.
http://aa.usno.navy.mil/data/index.php
https://www.almanac.com/astronomy/moon/full
http://www.angelfire.com/wa3/angelline/moon_lore.htm
http://joellessacredgrove.com/Holidays/esbats.html