The armillary sphere was a popular instrument used by Indian astronomers to observe the positions of celestial bodies, including the Moon.

Tithi is the term used in Indian astronomy to describe the Moon's position relative to the Sun, and it is used to determine the lunar day.

Mean Motion is a method used in Indian astronomy to calculate the Moon's position by assuming a constant angular velocity.

Nakshatra is the term used in Indian astronomy to describe the Moon's position relative to the stars, and it is used to determine the lunar mansion.

A Total Lunar Eclipse occurs when the Moon passes through the Earth's umbra, resulting in the complete obscuration of the Moon.

Yoga is the term used in Indian astronomy to describe the combination of a Tithi and a Nakshatra.

A Penumbral Lunar Eclipse occurs when the Moon passes through the Earth's penumbral shadow, resulting in a partial obscuration of the Moon.

Karana is the term used in Indian astronomy to describe the combination of a Tithi, a Nakshatra, and a Yoga.

An Annular Lunar Eclipse occurs when the Moon passes through the Earth's antumbral shadow, resulting in a ring of light around the Moon.

Declination is the term used in Indian astronomy to describe the Moon's position relative to the Earth's equator.

Mean Motion is a method used in Indian astronomy to calculate the Moon's position based on its mean motion, which is the average angular velocity of the Moon over a long period of time.

Longitude is the term used in Indian astronomy to describe the Moon's position relative to the Earth's ecliptic.

True Motion is a method used in Indian astronomy to calculate the Moon's position based on its true motion, which is the actual angular velocity of the Moon at any given time.

Altitude is the term used in Indian astronomy to describe the Moon's position relative to the Earth's horizon.