How long is it after dark in Xi than in Nanjing?

According to the weather network, there is no time difference between Nanjing and Xi.

1. The time zones of Nanjing, Jiangsu, China and Xi 'an, Shaanxi are also the time zones of East Zone 8, and the theoretical latitude and longitude time zone is East Zone 7. Although the latitude and longitude of the two places are different, they both use Beijing time, so there is no time difference between Nanjing and Xi 'an. The only difference between the natural environment is temperature and climate.

2. Dark principle: Day and night are generated by rotation, which is called "solar day", but the length of day and night is not equal to the rotation period, because the earth rotates once and revolves at the same time, which changes the relative angle between the earth and the sun. Day and night are based on the range of the sun shining on the earth, so a day and night is 3 minutes and 56 seconds longer than the rotation period.

3. Dark features: When the earth rotates, the ground facing away from the sun is "daytime" and the ground facing away from the sun is "night". This is the formation of day and night. After the vernal equinox, there are more and more sunshine in the northern hemisphere, so the nights in the northern hemisphere are short and the days are long, while the days in the southern hemisphere are the opposite; After the autumnal equinox, there is more and more sunshine in the southern hemisphere, so the days in the northern hemisphere are short and the nights are long, while the southern hemisphere is still the opposite.