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Old 18-03-2017, 08:15 PM
astro744
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Join Date: Apr 2007
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One more thing about Jupiter. It is currently just over 43 arc seconds in angular size. In Sep 2022 it will be over over 49 arc seconds; about 15% larger in appearance. This is significant and noticeable in the details seen.

43 arc seconds is still larger than the 25 arc seconds Mars is capable of and that only every 15-17 years or so (next two oppositions are good). Mars comes around every 2 years and 2 months but only every 15-17 years us it favourable near 25 arc sec or at least over 20 arc sec.

You can get info at Calsky or USNO.
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