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Interesting point regarding Neptune and conjunctions...
On the night of its discovery - September 23–24, 1846 - by astronomer Johann Gottfried Galle, Neptune was about 1 degree from Saturn.
Considering how often it does make a close conjunction with the brighter planets - which at that time must have been just as popular telescopic targets as they are now - I find it interesting no-one had noticed an 8th magnitude interloper tagging along close by, whose relative position changed quite obviously over weeks/months, until then.
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