🌍Earth's rotation and revolution determine the length of a day and a year.
⏰The calendar is a human-made system that attempts to align with Earth's motions.
🔄Leap years are necessary to keep our calendar in sync with Earth's orbit.
🌞The tilt of Earth's axis causes the change in seasons.
📆The transition from the Julian to the Gregorian calendar fixed the drift in the calendar's alignment with the seasons.
Why do we have leap years?
—Leap years are added to account for the extra approximately quarter of a day it takes Earth to complete a full orbit around the Sun.
How does Earth's tilt affect the seasons?
—Earth's tilt causes the Sun's rays to hit different parts of the planet at varying angles, leading to the changing seasons.
What is the Gregorian calendar?
—The Gregorian calendar is the calendar system currently used in most of the world. It was introduced in 1582 to fix the inaccuracies of the Julian calendar.
Why did it take so long for some countries to adopt the Gregorian calendar?
—The adoption of the Gregorian calendar varied across different countries and regions due to political and religious reasons.
How does the Earth's rotation affect day and night?
—Earth's rotation causes the transition between day and night as different parts of the planet face towards or away from the Sun.
00:02Introduction to the topic of time and its relation to Earth's movements.
01:43Explanation of Earth's rotation and its impact on our perception of the stars moving across the sky.
06:05Discussion of Earth's revolution around the Sun and the resulting change in seasons.
09:08Explanation of leap years and their significance in keeping the calendar aligned with Earth's orbit.
12:18Introduction to the Julian and Gregorian calendars and the adjustments made to fix inaccuracies.
