The term 'CELESTIAL ALTAR' is composed of two crossword solutions, ARA and APSE. ARA is a three-letter word meaning 'ALTAR', while APSE is a four-letter word meaning 'CELESTIAL'. Together, they form the phrase 'CELESTIAL ALTAR', which is a term used to describe an ALTAR or shrine dedicated to a deity or other spiritual being. This type of ALTAR is often found in religious ceremonies and rituals, and is believed to be a place where the divine can be accessed.