What is the version of the following sentence with correct punctuation?

In particular this operation could be made around the time of equinox carefully determined by the equal length of day and night by first observing the sun in its setting point near the start of the fixed Aries in Ptolemys days and then measuring the distance to the moon if the moon appeared within the same visual field being already possible to see dimly at dusk and then finally to compute the length from here to Basiliscus near the start of Leo
In particular, this operation could be made around the time of equinox (carefully determined by the equal length of day and night) by first observing the sun in its setting point (near the start of the fixed Aries, in Ptolemy's days) and then measuring the distance to the moon (if the moon appeared within the same visual field) being already possible to see dimly at dusk, and then finally to compute the length from here to Basiliscus (near the start of Leo).