© NASA

The Earth at perihelion

Dominic Ford, Editor
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Ashburn
The sky at

The Earth's annual orbit around the solar system will carry it to its closest point to the Sun, at a distance of 0.98 AU.

The Earth's distance from the Sun varies by around 3% over the course of the year because its orbit is slightly oval-shaped, following a path called an ellipse. In practice, this variation is rather slight, however, because the Earth's orbit is very nearly circular.

The Earth completes one revolution around this oval-shaped orbit each year, and so it makes its closest approach to the Sun on roughly the same day every year. In 2017, this falls on 4 January.

Technically speaking, this marks the moment when the Sun appears larger in the sky than at any other time of year, and when the Earth receives the most radiation from it. In practice, however, a 3% difference in the Earth's distance from the Sun is barely noticeable.

Annual changes in our weather, for example between the summer and winter, are caused entirely by the tilt of the Earth's axis of rotation, rather than by any change in its distance from the Sun.

The position of the Sun at the moment of perihelion will be:

Object Right Ascension Declination Constellation Angular Size
Sun 19h01m -22°40' Sagittarius 32'31"

The coordinates above are given in J2000.0.

The sky on 04 January 2017
Sunrise
07:28
Sunset
16:59
Twilight ends
18:35
Twilight begins
05:52

6-day old moon
Waxing Crescent

36%

6 days old

Planets
Rise Culm. Set
Mercury 06:17 11:10 16:04
Venus 10:03 15:26 20:49
Moon 11:27 17:26 23:25
Mars 10:29 16:06 21:44
Jupiter 00:53 06:33 12:13
Saturn 05:48 10:35 15:23
All times shown in EST.

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.

Image credit

© NASA

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Latitude:
Longitude:
Timezone:

39.04°N
77.49°W
EDT

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