Starlab is a company which still makes classroom sized planetariums. Designed for 5-meter flexible domes inflated by a blower which is included. 5 planets are included (unlike all "home" projectors ever made). The price is too high for most homeowners: $13,550. Adjusted for inflation, the historic Nova classroom projector which included 5 planets would be about the same.
Those older Nova units may have required you to preset the planet positions at the beginning of the nighttime, and then it might simply rotate their sky position as following the earth's rotation. This would be OK for many purposes, except planetary alignments.
A full calculation of planetary positions is quite complicated.
Those older Nova units may have required you to preset the planet positions at the beginning of the nighttime, and then it might simply rotate their sky position as following the earth's rotation. This would be OK for many purposes, except planetary alignments.
A full calculation of planetary positions is quite complicated.
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