சூர்யகிரகணத்தின் போது உலக்கை எப்படி விழுந்தது?

A solar eclipse does not cause an upright wooden pestle (ulakkai) to fall down on its own. While viral claims suggest that cosmic gravity topples the pestle, the object only falls when disturbed by an outside physical force.

Alignment and gravitational forces

Every object in space exerts an attraction toward other objects. The Sun constantly pulls on the Earth, and the Moon also pulls on the Earth. During a solar eclipse, the Earth, Moon, and Sun line up along a single straight line. Because the Moon and the Sun are on the same side, their pulls combine in one direction, creating a tiny shift in Earth's gravitational force. This gravitational change is extremely slight, impossible to measure in daily life, and completely unable to knock over a balanced pestle.

Why the viral pestle toppled

• Many social media videos showed an upright pestle suddenly tumbling down during an eclipse.
• These videos claimed that strange eclipse forces or gravitational changes caused the pestle to lose balance.
• Any balanced upright object falls when an external physical force strikes it.
• The recorded footage actually reveals a stick tapping the base of the upright pestle to deliberately knock it down.

Why ancestors stood a pestle upright

Our ancestors developed a clever method to observe eclipses safely without looking at the sky. Staring directly at the Sun with bare eyes during a solar eclipse harms human vision. To monitor the progress of an eclipse safely, ancestors stood a pestle upright in an open area. They used the pestle not to test gravity, but as an indicator to observe changes in sunlight and shadows.

Tracking the eclipse with shadows

• When the Moon moves in front of the Sun during a solar eclipse, sunlight dims.
• Because the Sun is covered, the standing pestle fails to cast a normal, clear shadow.
• Once the solar eclipse passes, full sunlight returns to the area.
• The pestle then casts a sharp, visible shadow on the ground, signaling that the eclipse is complete.