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Mercury at inferior solar conjunction

Dominic Ford, Editor
From the Inner Planets feed

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The sky at

Mercury will pass very close to the Sun in the sky as its orbit carries it between the Sun and Earth.

This occurs once in every synodic cycle of the planet (116 days), and marks the end of Mercury's apparition in the evening sky and its transition to become a morning object over the next few weeks.

At closest approach, Mercury will appear at a separation of only 3°10' from the Sun, making it totally unobservable for several weeks while it is lost in the Sun's glare.

Mercury will also pass perigee – the time when it is closest to the Earth – at around the same time, since it will lie on exactly the same side of the Sun as the Earth in the Solar System. It will move to within a distance of 0.61 AU from the Earth, making it appear with its largest angular size. If it could be observed, it would measure 11.1 arcsec in diameter, whilst appearing completely unilluminated.

The exact position of Mercury at the moment it passes solar conjunction will be:

Object Right Ascension Declination Constellation Angular Size
Mercury 00h09m50s +04°31' Pisces 11.1"
Sun 00h14m +01°36' Pisces 32'04"

The coordinates above are given in J2000.0.

The sky on 24 March 2025
Sunrise
06:40
Sunset
19:00
Twilight ends
20:35
Twilight begins
05:05

24-day old moon
Waning Crescent

26%

24 days old

Planets
Rise Culm. Set
Mercury 06:26 12:46 19:06
Venus 05:54 12:27 19:00
Moon 04:18 08:41 13:03
Mars 12:25 20:08 03:53
Jupiter 09:57 17:28 01:02
Saturn 06:27 12:14 18:01
All times shown in EDT.

Warning

Never attempt to point a pair of binoculars or a telescope at an object close to the Sun. Doing so may result in immediate and permanent blindness.

Source

The circumstances of this event were computed using the DE405 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.

Related news

24 Mar 2025  –  Mercury at inferior solar conjunction
17 Apr 2025  –  Mercury at aphelion
21 Apr 2025  –  Mercury reaches highest point in morning sky
21 Apr 2025  –  Mercury at greatest elongation west

Image credit

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Cambridge

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42.38°N
71.11°W
EST

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