A leap second is a one-second modification that is sometimes used with atomic clocks, whenever there is a change in Earth's ...

The summer solstice marks the beginning of astronomical summer each year, typically falling between June 20 and June 22. In meteorology, the official start of the summer season is June 1, marking the ...

The time for the Moon to revolve around the Earth is about 27.3 days, while the Earth rotates once around its axis in 24 ...

Traditionally, the solstice marks the longest day and the start of summer. The event has fascinated civilisations for thousands of years.

The first day of autumn, caused by the fall equinox, happens on Sunday, September 22, 2024. The equinox happens when the sun's rays square up with Earth so the day is about as long as night. From ...

Earth’s rotation reached record speed in 2025, shortening days by up to 1.63 ms. It could be about to happen again as Earth ...

The fact that the Earth’s axis is pointing at a right angle to the Sun – neither toward it or away from it – is true for the entire planet, not just for dwellers in one hemisphere or another.

In the northern hemisphere, it typically falls on June 21, but the date of the solstice can range between June 20 and June 22. The summer solstice in 2025 will occur on Saturday, June 21. The exact ...

Friday is the longest day of the year north of the equator, where the solstice marks the start of astronomical summer.