Here's a practical example--you see an exact conjunction of two planets along the zodiac. But, looking at them in the sky, they aren't in the exact same place. They're separated by Declination.
They have the same longitude which represents their most important cosmic position as I gave an example here - https://www.astrologyweekly.com/forum/showpost.php?p=1022545&postcount=139 They have different ecliptic latitudes. The caelum is actually one sphere revolving around the Earth in 23 hours and 56 minutes, all planets also exhibit this daily motion in addition to their particular cycle. The Sun does not have latitude.
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