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Measuring time and calendars

Lessons 13–14 · 2 lessons · M. Mamadazimov. Astronomy Grade 11, 1st edition. DAVR NASHRIYOTI, Tashkent, 2018
Answers are for parents and teachers.
1
If the longitude difference is 75°, what is the local-time difference in hours?
2
If it is 09:00 in Tashkent (UTC+5), what hour is it in UTC?
3
How many days are there in 400 years of the Gregorian calendar?
4
Between 1801 and 1900 there are 25 years divisible by 4 (1804 … 1900) and 1900 is not a leap year. How many leap years?
5
Around which astronomical event does Navruz fall?