© NASA/Ricardo Nunes

Venus at dichotomy

Dominic Ford, Editor
From the Inner Planets feed

Objects: Venus
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Venus will reach half phase in its 2028 morning apparition. It will be shining brightly at mag -4.3.

From Fairfield , this apparition will be well placed and prominent, reaching a peak altitude of 40° above the horizon at sunrise on 1 Sep 2028.

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2028 morning apparition of Venus

01 Jun 2028 – Venus at inferior solar conjunction
05 Jul 2028 – Venus at greatest brightness
10 Aug 2028 – Venus at dichotomy
11 Aug 2028 – Venus at greatest elongation west
01 Sep 2028 – Venus at highest altitude in morning sky
23 Mar 2029 – Venus at superior solar conjunction

The table below lists the altitude of Venus at sunrise over the course of the apparition. All times are given in Fairfield local time.

Date Sun
rises at
Venus
rises at
Altitude
at sunrise
Direction
at sunrise
Mag Phase
13 Jun 202805:1604:20east-4.25%
23 Jun 202805:1803:4216°east-4.413%
03 Jul 202805:2203:1323°east-4.523%
13 Jul 202805:2902:5128°east-4.531%
23 Jul 202805:3702:3632°east-4.439%
02 Aug 202805:4602:2836°east-4.445%
12 Aug 202805:5602:2538°east-4.351%
22 Aug 202806:0702:2839°east-4.256%
01 Sep 202806:1702:3640°east-4.261%
11 Sep 202806:2702:4939°east-4.165%
21 Sep 202806:3703:0538°east-4.169%
01 Oct 202806:4703:2337°east-4.172%
11 Oct 202806:5703:4335°east-4.076%
21 Oct 202807:0904:0433°south-east-4.079%
31 Oct 202807:2004:2531°south-east-4.082%
09 Nov 202806:3103:4528°south-east-4.084%
19 Nov 202806:4304:0825°south-east-4.087%

Altitude of Venus at sunrise

A graph of the phase of Venus is available here.

Apparitions of Venus

14 Aug 2026 – Evening apparition
03 Jan 2027 – Morning apparition
21 Mar 2028 – Evening apparition
11 Aug 2028 – Morning apparition
27 Oct 2029 – Evening apparition
18 Mar 2030 – Morning apparition
02 Jun 2031 – Evening apparition

Observing Venus

Venus's orbit lies closer to the Sun than the Earth's, meaning that it always appears close to the Sun and is lost in the Sun's glare much of the time.

It is observable for a few months each time it reaches greatest separation from the Sun – moments referred to as greatest elongation. These apparitions repeat roughly once every 1.6 years.

On these occasions, Venus is so bright and conspicuous that it becomes the third brightest object in the sky after the Sun and Moon. It is often called the morning star or the evening star.

Venus's phase

Venus's phase varies depending on its position relative to the Earth. When it passes between the Earth and Sun, for example, the side that is turned towards the Earth is entirely unilluminated, like a new moon.

Conversely, when it lies opposite to the Earth in its orbit, passing almost behind the Sun, it appears fully illuminated, like a full moon. However, at this time it is also at its most distant from the Earth, so it is actually fainter than at other times.

Venus shows an intermediate half phase – called dichotomy – at roughly the same moment that it appears furthest from the Sun, at greatest elongation. The exact times of the two events may differ by a few days, only because Venus's orbit is not quite perfectly aligned with the ecliptic.

Venus's position

The coordinates of Venus when it reaches dichotomy will be:

Object Right Ascension Declination Constellation Angular Size
Venus 06h09m50s 20°03'N Orion 23.6"
Sun 09h21m 15°25'N Cancer 31'33"

The coordinates above are given in J2000.0.

The sky on 10 Aug 2028

The sky on 10 August 2028
Sunrise
05:54
Sunset
19:57
Twilight ends
21:44
Twilight begins
04:07

19-day old moon
Waning Gibbous

73%

19 days old

Planets
Rise Culm. Set
Mercury 07:16 13:59 20:42
Venus 02:27 09:45 17:03
Moon 21:37 04:13 10:59
Mars 03:01 10:33 18:06
Jupiter 09:13 15:24 21:35
Saturn 23:23 06:11 13:00
All times shown in EDT.

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.

Related news

24 Mar 2028  –  Venus at highest altitude in evening sky
11 Aug 2028  –  Venus at greatest elongation west
01 Sep 2028  –  Venus at highest altitude in morning sky
27 Oct 2029  –  Venus at greatest elongation east

Image credit

© NASA/Ricardo Nunes

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41.14°N
73.26°W
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