चंद्रमा की कक्षा में वह बिंदु क्या कहलाता है जब वह पृथ्वी के सबसे निकट होता है?

What is the exact period of Earth's revolution around the Sun?

The phenomenon by which the same hemisphere of the Moon always remains turned towards the Earth is known as:

The phenomenon where the Sun, Earth, and Moon align in a straight line to cause a total or partial shadow on one another is called a/an _______.