Usage
of the Astrolabe
Introduction
The astrolabe is an open and combinable system. We can use it to demonstrate the revolving of stars, measure the height of stars or objects, know the position of sun. On top of that, we can calculate the current moment. If combined with astronomical charts, the astrolabe can also realize more complex functions.
Core features
I Demonstrate the revolving of stars
1. One of the functions of the astrolabe is to simulate the revolving of stars. The outermost arc of the horizon latitude and longitude network on the climate disk represents the horizon, with east on the left and west on the right.
Core features
II Measure the height of stars
1. Observing the height of stars or objects is another function of the astrolabe. At this time we need to use the back of the astrolabe.
Suppose we are in Beijing (40°N) on the night of June 7, 2023, and want to know the horizon latitude of Vega. Of course, this requires us to be able to first identify which star is Vega in the night sky.
Core features
III Know the position of sun
1. Unlike other stars, the sun moves from west to east on the ecliptic over the year. The eccentric circle on the rete represents the ecliptic of the sun's annual motion.
Using the astrolabe, we can know the position of the sun on the ecliptic on a given day, just by knowing the date of the day.
Core features
IV Calculate time
1. Calculating time is one of the most commonly used functions of an astrolabe. To achieve it, you need to master the above three functions.
Assume that on the night of June 7, 2023 in Beijing, we have learned from previous observations and operations that the horizon latitude of Vega is 36°, and the sun is at Gemini 17° on that day.
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