Venus - Observation


Venus is always brighter than any star (apart from the Sun). The greatest luminosity, apparent magnitude −4.9, occurs during crescent phase when it is near the Earth. Venus fades to about magnitude −3 when it is backlit by the Sun. The planet is bright enough to be seen in a mid-day clear sky, and the planet can be easy to see when the Sun is low on the horizon. As an inferior planet, it always lies within about 47° of the Sun.

Venus "overtakes" the Earth every 584 days as it orbits the Sun. As it does so, it changes from the "Evening Star", visible after sunset, to the "Morning Star", visible before sunrise. While Mercury, the other inferior planet, reaches a maximum elongation of only 28° and is often difficult to discern in twilight, Venus is hard to miss when it is at its brightest. Its greater maximum elongation means it is visible in dark skies long after sunset. As the brightest point-like object in the sky, Venus is a commonly misreported "unidentified flying object". U.S. President Jimmy Carter reported having seen a UFO in 1969, which later analysis suggested was probably the planet. Countless other people have mistaken Venus for something more exotic.

As it moves around its orbit, Venus displays phases in a telescopic view like those of the Moon: In the phases of Venus, the planet presents a small "full" image when it is on the opposite side of the Sun. It shows a larger "quarter phase" when it is at its maximum elongations from the Sun, and is at its brightest in the night sky, and presents a much larger "thin crescent" in telescopic views as it comes around to the near side between the Earth and the Sun. Venus is at its largest and presents its "new phase" when it is between the Earth and the Sun. Its atmosphere can be seen in a telescope by the halo of light refracted around the planet.

Read more about this topic:  Venus

Other articles related to "observation, observations":

MS Athena - Statistics
... areas Deck Emporio Boutique Calypso Fitness Centre Observation Beauty Salon Observation Sauna Observation Photo Shop Calypso Circe's Casino Calypso Chapel ...
Bazita Peak TV Tower
... a 13 m (43 ft) antenna atop the main structure and an observation level 60 m (200 ft) up the structure ... The Alps can be clearly seen from the observation deck ... Built in 1975, an elevator transports visitors to the café on the observation level and a staircase outside of the main shaft allows maintenance access ...
Covert Participant Observation
... Covert participant observation is a method in social science research ... Participant observation involves a researcher joining the group he or she is studying, and in the case of covert observation, the researcher's status is not made ... Observation involves participating in activities over a period of time and therefore becoming an accepted part of the group ...
Mirante Do Vale - Observation
... A bird's eye view of Mirante do Vale is possible from the observation decks of either the Altino Arantes Building or the Edifício Itália ...
Observations in Philosophy
... – Marcus Aurelius Observation in philosophical terms is the process of filtering sensory information through the thought process ... With the passage of time, impressions stored in the consciousness about many related observations, together with the resulting relationships and consequences, permit the ... The defining characteristic of observation is that it involves drawing conclusions, as well as building personal views about how to handle similar situations in the future ...

Famous quotes containing the word observation:

    There is no better proof of a man’s being truly good than his desiring to be constantly under the observation of good men.
    François, Duc De La Rochefoucauld (1613–1680)

    Let observation with extensive view;
    Survey mankind, from China to Peru;
    Samuel Johnson (1709–1784)

    Morality without religion is only a kind of dead reckoning—an endeavor to find our place on a cloudy sea by measuring the distance we have run, but without any observation of the heavenly bodies.
    Henry Wadsworth Longfellow (1807–1882)