Indeed you can. When at its brightest, Venus is about one-fourth as bright as all the rest of the stars (but not the Moon) put together. You can even see it for a bit when the Sun is out.
Eris can be seen in a telescope when it is at its closest approach to Earth, typically during opposition when it is opposite the Sun in the sky. Eris is located in the outer solar system in the Kuiper Belt, so it is quite small and faint, requiring a large telescope and dark skies to observe.
Any telescope can be used at any time. Depending on what you're looking for, though, you'll most likely realize greater or lesser success during different parts of the solar day. For example, the solar coelostat-telescope assembly is relatively useless during the night, the Schmidt camera at Palomar is quite unproductive in the day, a bird spotting scope is of limited usefullness at night, and the Hubble must be closed up during 45 minutes out of every 90.
The best time to use your telescope is typically during clear nights with no moonlight, away from city lights to minimize light pollution. The ideal conditions also include stable atmospheric conditions and when the objects you want to observe are high in the sky for better visibility.
An optical telescope cannot be used during cloudy days. Of course, this assumes that the telescope is located somewhere on the Earth's surface and therefore subject to weather. Since clouds obscure the sky - and any heavenly object otherwise visible - the optical telescope will be unable to see anything. A radio telescope, however, can see through clouds, simply because clouds do not block or cause significant interference to radiowaves reaching the Earth's surface from space.
The first astronaut to see Mars through a telescope was most likely one of the Apollo astronauts who orbited the moon in the late 1960s and early 1970s. These astronauts had training in celestial navigation and would have had access to telescopes for observation during their missions. However, I could not find specific information on which astronaut was the very first to view Mars through a telescope while in space.
At the Age of Exploration they used telescope to observe stars.
The telescope was invented in 1620 so they used that. Man's observation of the stars and planets has been going on thousands of years.
Eris can be seen in a telescope when it is at its closest approach to Earth, typically during opposition when it is opposite the Sun in the sky. Eris is located in the outer solar system in the Kuiper Belt, so it is quite small and faint, requiring a large telescope and dark skies to observe.
Any telescope can be used at any time. Depending on what you're looking for, though, you'll most likely realize greater or lesser success during different parts of the solar day. For example, the solar coelostat-telescope assembly is relatively useless during the night, the Schmidt camera at Palomar is quite unproductive in the day, a bird spotting scope is of limited usefullness at night, and the Hubble must be closed up during 45 minutes out of every 90.
which changes can you observe during the fermentation of dough
Gailileo made a telescope having about 20 power magnification, powerful enough to observe the mountains and valleys on Earth's Moon and the four largest moons of Jupiter. He did not invent the telescope, but improved the simple telescope invented by Dutch optician Hans Lippershey in 1608 by using the principles developed by Roger Bacon of England during the 13th century.
An animal that is active during twilight is called crepuscular.
The best time to use your telescope is typically during clear nights with no moonlight, away from city lights to minimize light pollution. The ideal conditions also include stable atmospheric conditions and when the objects you want to observe are high in the sky for better visibility.
During the day, you can use a telescope to see objects like the Moon, planets, and even the Sun (with proper filters to protect your eyes). Telescopes can also be used to observe birds, wildlife, and distant landscapes.
An optical telescope cannot be used during cloudy days. Of course, this assumes that the telescope is located somewhere on the Earth's surface and therefore subject to weather. Since clouds obscure the sky - and any heavenly object otherwise visible - the optical telescope will be unable to see anything. A radio telescope, however, can see through clouds, simply because clouds do not block or cause significant interference to radiowaves reaching the Earth's surface from space.
The first astronaut to see Mars through a telescope was most likely one of the Apollo astronauts who orbited the moon in the late 1960s and early 1970s. These astronauts had training in celestial navigation and would have had access to telescopes for observation during their missions. However, I could not find specific information on which astronaut was the very first to view Mars through a telescope while in space.
Watch it, and enjoy. Note: Care should be taken in the case of a solar eclipse - you must not look directly at the Sun, only through very dark filters, such as welding glasses. Watching through a telescope, or binoculars, is even more dangerous, but you can project the image from a telescope onto a sheet of paper.