I was just passing by during my review of SN in consideration of possibly using it exactly as you suggest: a cross reference for NASA, Stellarium, and code that I have written. Your suggestions to cross reference are excellent advice and had they been more amiably expressed, would not be overlooked. The question as clearly asked from a standpoint of a lack of understanding of the quite complex math that goes into astro software. At least I did not read that in the OP's post. Furthermore, no one is asking SN devs to go through Stellarium code and explain or justify the differences. Taking a defensive stance is not helpful when the OP was clearly asking a legitimate question and not launching an attack on Starry Night. The helpful answer to the OP's question about Stellarium is exactly that: There are variables (like ΔT) that introduce differences. And is there some way to add the seconds to the time? I have found that the seconds are important information to verify calculations. In Stellarium it is shown to be Ma1:42:35. Is there something that can be done to correct this discrepancy? In fact, I could not even find the Full Moon on Main Starry Night. I love the ease of clicking on "show events" in Starry night, but the inaccuracy will have me using Stellarium to complete this portion of the project. For instance, on ApBCE in Stellarium the 1st quarter is at 4/27 12:17:3. Some are off by days, and others are off by hours. What I am puzzled by is that the moon phases do not match at all. I had been using the free Stellarium software up until this download. I just last week purchased the Starry Night Pro Plus 8. I have created a timeline of events and now I am attempting to add the moon phases to the timeline. I am doing research for the period of 1446 BCE - 960 BCE.
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