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The Moon's changing phases and the Sun's daily and yearly cycles are natural clocks that gave us days, months, years, and calendars.
Understanding the Name of the Chapter
Keeping
Tracking or measuring something over time.
Time
Days, months, and years — the units we measure.
with
Using these sky cycles as the tool.
the
Pointing to the specific skies above us.
Skies
The Sun, the Moon, and the stars we observe.
What does the name of this chapter tell us?
- The sky has repeating cycles, like the Moon's phases.
- These cycles can be used to measure time.
- The Sun gives us the day; the Moon gives us the month.
- The Earth's orbit gives us the year and calendars.
Topics We Will Study in This Chapter
Topics We Will Study
Intro
Introduction
11.1
How Does the Moon's Appearance Change and Why?
11.2
How Did Calendars Come into Existence?
11.2.1
Lunar calendars
11.2.2
Solar calendars
11.2.3
Luni-solar calendars
11.2.4
The Indian National Calendar
11.3
Are Festivals Related to Astronomical Phenomena?
11.4
Why Do We Launch Artificial Satellites in Space?
