The planet re-emerges in the dawn twilight in early March for a morning apparition which lasts through to mid-April. Because Mercury is only ever seen in twilight, many of the fainter stars shown in the planet's vicinity may not be visible when the planet itself is observed. Printer-friendly versions of this chart are available for Northern and Southern hemisphere views. The four star names shown in yellow-green were officially adopted by the I nternational Astronomical Union IAU in At the Eastern edge of the 'wheel' asterism is Aqr Eta Aquarii, mag.
Neptune entered Aquarius in and will remain there until The planet crosses to the North of the celestial equator on February 8th, when its declination changes from negative to positive. In early February Venus is joined by Mercury approaching from the West, in the second paired apparition of the evening apparition. This particular apparition of Mercury favours Northern hemisphere observers, since from here the ecliptic presents a steep angle to the Western horizon after sunset at this time of year.
At this point in the apparition the distance between Venus and the Earth is reducing at an average rate of about 1. The unsteady 'boiling' effect of the planet is caused by turbulence in the Earth's atmosphere.
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T he name was formerly standardized by the IAU in , the original name having been Torcularis Septentrionalis. Later that same day, Venus enters Aries. Venus ' passage through this small constellation is an eventful one, involving a planetary conjunction, a significant orbital position passage and a maximum solar elongation.
The exoplanet is the equivalent of 1. The planet's passage through perihelion at this moment in time is significant for Northern hemisphere observers for a reason which will be explained shortly. The name was formally recognised by the IAU in and it first appeared in a star catalogue compiled by the French astronomer Nicolas-Louis de Lacaille Venus in the Western Sky at dusk, photographed by the writer during the planet's evening apparition in January Venus had recently passed greatest elongation and shone at magnitude A t around 15 hours UT on the following day 23rd the distance between the Earth and Venus is the same as that between the Sun and Venus , at 0.
At latitudes South of the Southern Tropics the planet's altitude at any given period after sunset has reduced considerably since the optimal period in December. For a few days around greatest elongation, telescopic observers often attempt to determine the precise date of dichotomy. It is the moment when the terminator the line separating the light and dark sides of the planet appears perfectly straight, essentially dividing Venus into two perfect halves. Solar System geometry suggests that this should occur on greatest elongation day, however it often does not and the precise reason for this was not understood until quite recently.
Observers often report the straight terminator a few days earlier or later than the greatest elongation date early in evening apparitions and late in morning apparitions.click here
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The phenomenon is thought to be due to Venus ' dense atmosphere scattering the sunlight. Blue light scatters more readily than red light which is why the sky on Earth appears blue and this effect is also seen on Venus when it is observed using coloured eyepiece filters. For Northern hemisphere observers the date of Venus ' maximum solar elongation in is ideal, since it coincides with the period during which the planet attains its highest position above the local horizon after sunset.
Higher latitudes do not fare much worse. In addition, Venus ' passage through perihelion only a few days earlier means that it is slightly brighter than normal at this point. For the naked-eye planet observer situated at mid- and high-Northern latitudes, Venus ' apparition is the best evening apparition in the planet's apparition 'cycle' there being five evening and five morning apparitions in each Venusian 8-year 'Cycle'.
In contrast, for Equatorial and Southern hemisphere observers it is the worst evening apparition in the 'cycle'. Because of the planet's glare when seen against a darkening sky, coupled with the Earth's troublesome atmospheric turbulence at low altitudes, most experienced telescope users observe the planet in full daylight, when it is high above the horizon and more easily seen against a brighter sky.
Greatest elongation day having passed, Venus begins to show a crescent phase through telescopes, its apparent size continuing to enlarge slightly with each passing day. From April 3rd to 4th the planet passes South of the open star cluster known as the Pleiades or M Also known by the name The Seven Sisters , they are probably the best-known star cluster in the night sky. Under dark skies the seven brightest stars in the group can be seen with the naked-eye; they are Alcyone Tauri or Eta Tauri , mag. It appears to be part of the cluster but i n fact, it is not a physical member of the Hyades group; its appearance in the cluster is purely a line-of-sight effect.
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Positioned at the 'bend' of the Bull's Northern horn, it is a multiple-star system and a member of an obscure open star cluster known as Alessi As Venus proceeds towards the North-eastern corner of Taurus , its apparent motion against the background stars is slowing. Venus attains its greatest brilliancy for this apparition mag. Greatest brilliancy occurs when the percentage of the illuminated portion of the disk phase and its angular size combine to best visual effect.
Across the world, t he planet now sets at its most Northerly point along the local horizon. H ereafter Venus moves retrograde against the background stars, its declination and ecliptic latitude reducing as it accelerates towards the close of the apparition. From around mid-May, steadily-held binoculars begin to detect Venus as a tiny crescent soon after sunset as the planet languishes low in the WNW sky.
The crescent appears greatly disturbed by the Earth's turbulent atmosphere and is split into the r a i n b o w colours by an effect called dispersion an example of how dispersion appears through a telescope can be seen here. This is Mercury 's second evening apparition of and its third overall there having been a morning apparition in-between. As the Venusian crescent continues to enlarge it also becomes more slender, such that the dark non-illuminated side of the planet is well-displayed when seen from the Earth.
Telescopic observers now begin their search for the mysterious and elusive Ashen Light , a faint glowing of the night side of Venus which until recently had no clear explanation. Whilst this may seem extraordinary, the planet's apparent size of around 57" brings it very close to the generally-accepted resolution of the human eye, i.
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By the end of May Venus becomes lost from view from all locations as it speeds towards inferior conjunction passing between the Earth and the Sun on June 3rd. Venus Conjunctions with other Planets in Not all planetary conjunctions will be visible from the Earth, however, because many of them take place too close to the Sun. Furthermore, not all of them will be seen from across the world; the observers' latitude will affect the altitude angle above the horizon at which the two planets are seen at the time of the event and the local season will affect the sky brightness at that particular time.
A flat, unobstructed horizon will normally be required to observe most of them. Jupit e r is affected to a much lesser extent since it is always above magnitude A Conjunction of Jupiter and Venus in the dusk sky, photographed by the writer in March A significant factor in determining whether a planetary conjunction is 'easy' or 'difficult' is the altitude that the fainter planet is positioned as it comes into view in the dusk twilight.
This in turn affects the duration for which the pair are visible thereafter. In this context, the six planetary conjunctions of will now be discussed. Even when the solar elongation is favourable, a further problem beckons in that the glare caused by Venus ' brilliance makes it difficult to see the much fainter planet beside it.
In both cases the planets set in darkness from all but higher Southern latitudes. The first, on October 30th , takes place early in the apparition when observers at higher Northern latitudes have not yet begun to see Venus emerge in the dusk sky. The widely-separated pair are however ideally placed for Southern hemisphere observers.
The separation column ' Sep ' is the angular distance between the two planets, measured relative to Venus, e.
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The ' Fav. The ' Con ' column shows the constellation in which the planets are positioned at the time of the conjunction. The table is excerpted from another showing Venus conjunctions with other planets from to on the Venus Conjunctions page. Although any given conjunction takes place at a particular instant in time, it is worth pointing out that, because of the planets' relatively slow daily motions, such events are interesting to observe for several days both before and after the actual conjunction date.
There are in fact two methods of defining a planetary conjunction date: one is measured in Right Ascension i. Moon near Venus Dates, September to May T he Moon is easy to find, and on one or two days in each month, it passes Venus in the sky. Use the following tables to see on which dates the Moon passes near the planet between September and May The Vedic legend says that Mercury is the offspring of Jupiter and Moon, hence it has the characteristics of both of these planets.
So it is a key planet for Lawyers, sales professionals, artists, and scientists. Mercury's impact is the strongest when it is positioned in Virgo and is low while in Pisces.
The friendly planets of Mercury are Sun, Venus, and Rahu. Mercury has a bit of animosity towards Moon but is neutral with all other planets. The planet pertains to diseases relating to head, skin, and throat. The most sacred of all the months in the Hindu calendar, the month of Kartik falls between the November-December months according to the Gregorian calendar.
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The festival of Ka Please introduce links to this page from related articles ; try the Find link tool for suggestions. January Mathematical Astronomy Morsels Ch. National Aeronautics and Space Administration. Retrieved 15 March Archived from the original GIF on March 7, Archived from the original on Retrieved University of Illinois. Retrieved 5 September Journal of the British Astronomical Association.