The spherical astrolabe was invented by Abū Ishāq Ibrāhīm al-Zarqālī, a Muslim astronomer and engineer from Al-Andalus (modern-day Spain). Al-Zarqālī's spherical astrolabe was an improvement on earlier flat astrolabes, allowing for easier calculations of celestial positions and timekeeping.
An astrolabe is an old instrument used to calculate the position of celestial bodies. Here are some sentences.I found an antique astrolabe in an old store.An astrolabe was used before the sextant was invented.Polish that astrolabe so it doesn't tarnish.
No, the astrolabe is no longer commonly used for navigation or astronomy. It has been largely replaced by more modern and accurate tools such as GPS devices and telescopes. Astronomers and historians may sometimes use astrolabes for educational or historical purposes.
An astrolabe is typically made of metal, such as brass, that is engraved with various markings for celestial navigation. The device also includes a rotating arm called an alidade, which is used to measure the altitude of stars and celestial bodies. Some astrolabes may have additional components made of wood or other materials.
The scientist used an astrolabe to find the altitude of the sun and stars.
Astrolabe
the sun
Astrolabe
A sextant is a device used to determine a ship's latitude by measuring the angle between the horizon and the celestial body, typically the sun or a star. This information is then used in conjunction with nautical charts to calculate the ship's position on the Earth's surface.
The spherical astrolabe was invented by Abū Ishāq Ibrāhīm al-Zarqālī, a Muslim astronomer and engineer from Al-Andalus (modern-day Spain). Al-Zarqālī's spherical astrolabe was an improvement on earlier flat astrolabes, allowing for easier calculations of celestial positions and timekeeping.
An astrolabe is a calculating device, kind of like a circular slide rule (which is probably just as mysterious an instrument to anybody under 35). One does not actually "discover" things with it so much as work them out, such as the date of the next eclipse.
compass, and the astrolabe
I used an astrolabe because i felt like it.
An astrolabe is an angle-measuring device, vaguely similar to a sextant or an octant. Holding the astrolabe by a cord, one sights through a set of peepholes to observe a star, and you can then read the angle of elevation of the star above the horizon. It's not especially accurate, particularly not when on the pitching deck of a ship at sea. Columbus would have used this device to measure the elevation of the north star Polaris above the horizon, giving him his latitude (at least, approximately...). In order to calculate longitude, one also needs an accurate clock, which Columbus did NOT have.
it is a mobile reading device.
astrolabe=star+mechanical clock
== == the astrolabe is to find the altitude of a stellar object