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Old August 14th 18, 05:40 PM posted to sci.astro.amateur
Gerald Kelleher
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Default The expanded story of longitude

I see these giddy celebrity astronomers appeal to what is effectively worthless parallax which obscures a straightforward transitional use of the stars from left to right of the Sun or from an evening appearance to a morning appearance as we use the local horizon and rotation as an observational gauge for this transition. It also happens with the inner planets as they run a smaller circumference and loop around the parent Sun much as Jupiter's satellites run a circuit of their parent planet, in the case of Mercury and Venus, they move left to right and right to left in a smaller loop than that of the Earth -

https://www.youtube.com/watch?v=FcrBAuLBXag

Hard to imagine that a society would neglect the differences between the illusory loops of the slower moving planets with their larger circumferences and the actual loops of the faster moving planets with their smaller orbital diameters. Human timekeeping sits inside the latter direct/retrograde resolution as the first annual appearance of Sirius as an orbital marker is also the event which demonstrates a central Sun and an orbiting Earth.