The Moon and Saturn will make a close approach, passing within 4°02' of each other. The Moon will be 21 days old.
From Cambridge , the pair will be visible in the dawn sky, rising at 02:03 (EST) – 3 hours and 31 minutes before the Sun – and reaching an altitude of 23° above the south-eastern horizon before fading from view as dawn breaks at around 04:57.
The Moon will be at mag -11.9; and Saturn will be at mag 0.5. Both objects will lie in the constellation Capricornus.
They will be too widely separated to fit within the field of view of a telescope, but will be visible to the naked eye or through a pair of binoculars.
At around the same time, the pair will also share the same right ascension – called a conjunction.
A graph of the angular separation between the Moon and Saturn around the time of closest approach is available here.
The positions of the pair at the moment of closest approach will be as follows:
| Object | Right Ascension | Declination | Constellation | Magnitude | Angular Size |
| The Moon | 21h06m20s | 21°24'S | Capricornus | -11.9 | 31'11"8 |
| Saturn | 21h02m10s | 17°29'S | Capricornus | 0.5 | 16"7 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 90° from the Sun, which is in Aries at this time of year.
The sky on 3 May 2021
| The sky on 3 May 2021 | ||||||||||||||||||||||||||||||||||
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45% 21 days old |
All times shown in EDT.
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Source
The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).
This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.
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| 29 Sep 2020 | – Saturn ends retrograde motion |
| 23 May 2021 | – Saturn enters retrograde motion |
| 02 Aug 2021 | – Saturn at opposition |
| 10 Oct 2021 | – Saturn ends retrograde motion |
Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.