The planet Mercury can never be in the sky at your local midnight. Mercury's orbit is so small that as seen from the earth, it's always near the sun. So if the sun has been down for a while, then Mercury also must be down. Venus can be seen later (or earlier) than Mercury, but it's still inside the Earth's orbit and therefore can't be seen at midnight either.
Mercury and Venus can never be seen at opposition from Earth because they orbit closer to the Sun than Earth, meaning they can never be directly opposite the Sun in the sky.
The planets continually move among the stars, causing them to appear in constantly changing places, in the sky and among the constellations. Mercury and Venus can never appear in the east at sunset. Since their orbits keep them closer to the sun than earth's orbit keeps us, there's a limit to how far from the sun they can appear in our sky. But each of the so-called "superior" planets ... each one farther from the sun than earth ... can appear anywhere in our sky at some point during its orbit.
Planets like Venus, Mars, Jupiter, and Saturn are often visible in various constellations depending on their current positions in the sky. For example, Venus is commonly seen near the constellations of Taurus and Gemini, Mars can be found near Scorpius and Sagittarius, Jupiter in Libra and Scorpius, and Saturn in Sagittarius and Capricornus. These positions change over time as the planets move along their orbits.
Planets can be seen from Earth because they reflect sunlight, making them visible in the night sky. The planets in our solar system are relatively close to Earth, which allows them to be seen without a telescope or binoculars. Their brightness and position change as they move along their orbits around the Sun.
Planets can be seen because they reflect sunlight. As light from the Sun hits the planets' surfaces, some of it is absorbed, and the rest is reflected back towards us on Earth, making them visible in the night sky.
Neither Mercury nor Venus are visible at midnight. Both planets are closer to the Sun than the Earth is.
It depends where you are. Some planets can be seen overhead at different times at latitudes up to about 24 or 25 degrees, but at higher latitudes they are never overhead. They are highest in the sky at midnight in the winter. At that time they are passing through the constellations of Taurus and Gemini when seen from the northern hemisphere, or Ophiuchus and Sagittarius from the southern hemisphere. That applies to all eight planets.
The five outer planets are the ones with bigger orbits than the Earth, which are Mars and the four giant planets. The outer planets can be seen at their brightest at midnight, when they are at opposition. That never happens for the inner planets Mercury and Venus.
The number of planets never seen could be millions, billions, or trillions. We just have never seen them.
Mercury and Venus are the two planets that are never visible at midnight from Earth. This is because they are inner planets, orbiting closer to the Sun than Earth, and therefore are always located near the Sun in the sky.
venus... :)
Inner planets orbit inside the orbit of the Earth, can only be seen in the morning or evening sky and are never seen as full disks form the Earth. Outer planets orbit further out than the orbit of Earth and can be seen from time to time as full disks in 'opposition' or overhead at midnight.
Mercury and Venus can never be seen at opposition from Earth because they orbit closer to the Sun than Earth, meaning they can never be directly opposite the Sun in the sky.
The planets continually move among the stars, causing them to appear in constantly changing places, in the sky and among the constellations. Mercury and Venus can never appear in the east at sunset. Since their orbits keep them closer to the sun than earth's orbit keeps us, there's a limit to how far from the sun they can appear in our sky. But each of the so-called "superior" planets ... each one farther from the sun than earth ... can appear anywhere in our sky at some point during its orbit.
Both Venus & Mercury.
Both Venus & Mercury.
Planets appear to move horizontally when they are in that part of the ecliptic that lies horizontally across the southern horizon at midnight (seen from the northern hemisphere). That occurs when a planet is at a right-ascension of 18 hours (in Sagittarius), and a couple of hours either side. A snapshot of the planet taken every night at midnight shows it moving horizontally (approximately) from right to left. All planets do this.