Belt of Venus

Source: Wikipedia, the free encyclopedia.
The full moon seen through the Belt of Venus. Note that the full Moon is near the centre of the field of view, which means that the Sun must be behind the camera.
The Belt of Venus seen from an airplane at an altitude of 42,000 ft (13,000 m)
Belt of Venus evolution (dusk)

The Belt of Venus (also called Venus's Girdle, the antitwilight arch, or antitwilight

civil twilight. It is a pinkish glow that surrounds the observer, extending roughly 10–20° above the horizon. It appears opposite to the afterglow
, which it also reflects.

In a way, the Belt of Venus is actually alpenglow visible near the horizon during twilight, above the antisolar point. Like alpenglow, the backscatter of reddened sunlight also creates the Belt of Venus. Though unlike alpenglow, the sunlight scattered by fine particulates that cause the rosy arch of the Belt shines high in the atmosphere and lasts for a while after sunset or before sunrise.[2]

As twilight progresses, the arch is separated from the horizon by the dark band of

interplanetary dust in the Solar System
, are also similar phenomena.

The Belt of Venus can be observed as having a vivider pink color during the winter months, as opposed to the summer months, when it appears faded and dim above the yellowish-orange band near the horizon.[citation needed]

The name of the phenomenon alludes to the cestus, a girdle or breast-band, of the Ancient Greek goddess Aphrodite, customarily equated with the Roman goddess Venus. Since the greatest elongation (angular separation between the Sun and a Solar System body) of Venus is only 45–48°, the inferior planet never appears in the opposite of the Sun's direction (180° difference in ecliptic longitude) from Earth and is thus never located in the Belt of Venus.

See also

References

  1. ^ "Definition of ANTITWILIGHT". www.merriam-webster.com.
  2. ISSN 1431-9756
    .

External links