What's the reason behind Solar Eclipse?

The colossal rare Total Solar Eclipse is upon us and millions have geared up across Mexico, Canada, and the United States to witness the once-in-a-lifetime event.

With the event close, people are wondering what causes this celestial event.

Per Nasa, US space agency, the eclipse occurs when three things are lined up either fully or partially — the Sun, the Moon, and Earth.

It added that depending on how they align, the eclipse provides a unique view of either the Sun or Moon.

“A solar eclipse happens when the Moon passes between the Sun and Earth, casting a shadow on Earth that either fully or partially blocks the Sun’s light in some areas.”

“This only happens occasionally, because the Moon doesn't orbit in the exact same plane as the Sun and Earth do. The time when they are aligned is known as eclipse season, which happens twice a year.”

“Except for the fleeting moments of totality during a total solar eclipse, observers should always use eclipse glasses or an alternative safe solar viewing method, such as a pinhole projector, to view the Sun. This includes when watching a partial or annular eclipse, or before or after totality for a total solar eclipse.”