Look at the new moon and enter the intersection instrument

[Looking at the New Moon Crossing Instrument]

Looking at the New Moon Crossing Instrument, Qianlong, Qing Dynasty, with a total length of 68.4 cm, a width of 25.2 cm and a height of 12 cm. Made by the Qing Palace Building Office. The old collection of the Qing Palace
The synoptic instrument is a special instrument for demonstrating solar and lunar eclipses. The bottom layer is set with the ecliptic, carved with 15 ° 30 ‘, that is, 15 days and a half, and attached with a movable shadow plate. The middle layer is white with the same scale as the ecliptic, and a lunar model is installed on it. The top is the time table, with a solar body model at the beginning and a straight table at the end
Demonstrate the solar eclipse phenomenon with the transit instrument, make the time table and the solar body at the head of the table move left and right on the ecliptic of the seat frame, and look at the position where the solar body is covered by the lower white channel, then there will be different solar eclipse phenomena such as “total solar eclipse, annular solar eclipse, partial solar eclipse”; At the same time, the timetable also directly reflects the time of each eclipse
Demonstrate the lunar eclipse phenomenon with the transit instrument. First align the center of the timetable with the white track, and then fix the earth shadow plate on the ecliptic track under the moon model on the white track. Move the white track north and south of the instrument base according to the previous method. The moon on the white track is covered by the earth shadow on the lower disc, and the phenomenon of total lunar turbidity and partial lunar eclipse can occur; At this time, the straight table at the end of the time table also indicates the time of the total lunar eclipse and partial lunar eclipse