I have read in Shridhara Maharaja’s “Subjective Evolution of Consciousness” his devotional explanation of brahma gayatri. Did he write or give orally an explanation of the other 6 gayatris and if so where can I find it?
Or other acharyas commentaries and explanations of the gayatri mantras?
He wrote a Sanskrit comment to it.
The book Sri Gayatri Mantrartha Dipika is what you are looking for. It has various comments for all the mantras we chant daily. Mandala Publishing should have it.