the year is divisible by 400, then it is a leap year. So 1996 was a leap year, but 1997, 1998, and 1999 were not. The year 2000 was a leap year, because even though it is divisible by 100 it’s also divisible by 400. The years 1700, 1800, and 1900 were not leap years, but 2000 was.২৯ ফেব, ২০১৬

Horologists around the world have added a “leap second”, making the final minute of June 30 last 61 seconds to compensate for Earth’s wibbly-wobbly movements.১ জুলাই, ২০১২

Since then, we have added 37 leap seconds, always on June 30 or December 31. The possibility was left open that if the Earth decided to speed up enough, a second could be skipped. This is called a negative leap second. The jumps are leap seconds, inserted so |UT1-UTC| will always be < 0.9 seconds.৫ মার্চ, ২০২১

Owing to its revolution around the Sun, the Earth must rotate approximately 361° to mark a solar day. Over the course of a 365-day year, the Sun appears to move not only up-and-down in the sky, as… That extra rotation takes 235.91 seconds, which is why our solar day is 24 hours on average.২৯ জুলাই, ২০১৯

Because of the way the second is defined, the mean length of a day is now about seconds, and is increasing by about 1.7 milliseconds per century (an average over the last 2,700 years).

The Earth is moving faster than it ever has in the last 50 years, scientists have discovered, and experts believe that 2021 is going to be the shortest year in decades. This is because the Earth is spinning faster on its axis quicker than it has done in decades and the days are therefore a tiny bit shorter.

Due to this increase in rotation speed, scientists report that the average day in 2021 is expected to be 0.05 milliseconds shorter than the 86,400 seconds that normally make up the 24-hour period. Delaney says adding an extra second to clocks in what is called a leap second can help with this.১৯ জানু, ২০২১

Scientists say Earth is spinning faster than it has in decades. The Earth’s 28 fastest days on record (since 1960) all occurred in 2020. The Earth’s rotation can change slightly because of weather and ocean patterns.৮ জানু, ২০২১

460 meters per second

Our Galaxy, the Milky Way, is a disk of stars about 100,000 light-years across, and about 1,000 light-years thick. So, to leave our Galaxy, we would have to travel about 500 light-years vertically, or about 25,000 light-years away from the galactic centre.

Based on Doppler shifting of its light, Andromeda is speeding toward us at 68 miles per second (110 kilometers per second). As Andromeda gets closer, the gravitational attraction between it and the Milky Way gets stronger and Andromeda accelerates in our direction.২৩ জানু, ২০১৯

And that’s going to happen someday! The Andromeda galaxy is currently racing toward our Milky Way at a speed of about 70 miles (110 km) per second.১৫ অক্টোবর, ২০২০

The Andromeda Galaxy (M31) is indeed approaching us, by about 300 kilometers (190 miles) per second measured with respect to the Sun. If you subtract the Sun’s orbital motion around our galaxy (about 230 km per second toward Cygnus), M31 is still approaching the Milky Way by about 130 km per second.