Chandra Graha gayatri mantrams are the Gayatri mantras to be chanted during Chandra graham puja or Chandra japam. Chandra deva or the Moon God is worshipped mainly on Sankashti Chaturthi, Purnima (Full Moon), and many other important occasions. As each god has Gayatri Mantra, Chandra Gayathri mantrams are also there. Here are the Chandra Gayatri mantras for Adhi devata and Prati devata along with the main mantra.
Chandra Graha Gayatri Mantram
Om nishakaraya vidmahe kalanathaya dheemahi thanna chandrah prachodayath
Adhi Devata Mantram
Om ramadevyai cha vidmahe vishnupathnai cha dheemahi thanno lakshmi prachodayath
Prathyadhi devata mantram
Om rasarupabhyo vidmahe dravathmakabhyo dheemahi thanna aapah prachodayath