Does every star we see in our night sky have a system of planets around it like we have around our star?

All five of the naked-eye planets will be visible at the same time in the evening — an event to happen on April 2036. The sky show will be at its best from late March into the first days of April: The five brightest naked-eye planets will all be simultaneously in view in the early evening sky from roughly 45 to 90 minutes after sunset. In addition, from March 22 through April 2, the moon will traverse the scene and on some evenings will appear to pass close to this or that world.

The period of time during which any given planet (or any other celestial body) can be seen is known as an apparition. For Mercury and Venus, this is the period during which the planet is well seen in either the morning sky or the evening sky. For Mars and beyond, an apparition is measured from the time the planet becomes visible in the dawn sky (rising shortly before the Sun) to the time it disappears into the dusk sky (setting shortly after the Sun).

The length of a planet's apparition depends upon its orbital period (i.e. The time it takes the planet to orbit the Sun) and its position in relation to the Sun and the Earth at any given time. Apparitions can last from just a few weeks (in the case of Mercury) to almost two years (for Mars) although a planet is normally seen at its best for only a part of this time.

When two or more planets are listed as being visible at 'Dawn' or 'Dusk' in any particular month (e.g. if Mercury, Venus and Mars all appear listed under 'Dusk' in a single month) they are likely to appear close together in the sky during this time, and planetary conjunctions (when two planets are at the same celestial longitude) are most likely to take place. A table of planetary conjunctions involving Venus (through to 2015) can be seen here, together with an assessment of their likely visibility. Conjunctions between the superior planets (i.e.

From Mars to Pluto) are included in the tables on Wikipedia - note however that many of these will be too close to the Sun to be seen. Southern hemisphere observers should refer to the RASNZ's planetary conjunctions table. With the exception of Mercury, the times are based on the planets' positions at mid-month.

Note that, although a planet may be listed as being visible at a particular time in a month, this does not necessarily mean that it will be visible from all locations on Earth. The observer's latitude and the local season can affect whether a planet is seen or not; this is particularly so for the 'Dawn' and 'Dusk' entries and especially so in the case of Mercury (see under Mercury's description for more details). Since the planets' viewing times can change in the course of a month (eg.

From Dawn to Morning sky visibility) the entries inevitably contain an element of imprecision; consequently the table should only be used as a general guide to assess the best times at which to view the planets.

It depends, I guess. Because the the time it takes for planets to orbit the sun are different. Like, you can see Mercury before sunrise or after sunset for a few days, while Saturn might stay in view for a longer period.

(My guess) If you want to see all the naked eye planets in one night, wait for August. Venus, Mars, Saturn, will be visible close to each other. Mercury will be low in the western horizon, and Jupiter probably will rise later in the night in the east.

With Uranus and Neptune, but they will be too faint. Just thought you might be interested.

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