The autumnal equinox—also called the September equinox or the fall equinox—arrives on Monday, September 22. Not only do temperatures drop, but plant life slows down, and so do we. Read about the first day of fall, plus some fun facts and folklore. When Is the First Day of Fall? The...
What was the first ceratopsian? When do the seasons start? What was the first Elephantidae? When was CODIS founded? When did prosauropods live? When is stereochemistry important? When was the Proterozoic era? When was the Ordovician period?
This is what causes the seasons During the summertime, the Northern Hemisphere is tilted towards the sun. So we get longer days as more light falls on this part of the surface. In the wintertime it's the Southern Hemisphere that gets the majority o light.Equinoxes occur when the axis of...
The First Day of Winter: Winter Solstice 2025 When Do the Seasons Start and End in 2025? This solstice marks the official beginning of summer in the Northern Hemisphere, occurring when Earth arrives at the point in its orbit where the North Pole is at its maximum tilt (about 23.5 degrees)...
When does the summer solstice occur? During the 21st century, the dates for the occurrence of the solstice can fall either on June 20th or 21st. How many hours of daylight do we get on the summer solstice? In the Northern Hemisphere, the length of daylight varies depending on the latitude...
When does the summer solstice occur? During the 21st century, the dates for the occurrence of the solstice can fall either on June 20th or 21st. How many hours of daylight do we get on the summer solstice? In the Northern Hemisphere, the length of daylight varies depending on the latitude...
Salt interrupts the process, however, and temperatures must drop lower to overcome that interruption and for freezing to occur. But if salt needs to interact with liquid water, how does it do anything when temperatur...
On April 8, 2024, there’s going to be a total eclipse of the Sun visible on a line across the US. But when exactly will the eclipse occur at a given location? Being able to predict astronomical events has historically been one of the great triumphs of exact science. But...
The ephemeris determines the seasons because the Earth's axis is tilted 23.5 degrees relative to its orbit around the Sun. Both the equinoxes and the solstices are related to the Earth's orbit around the sun. Does the fall semester...
This is what causes the seasons During the summertime, the Northern Hemisphere is tilted towards the sun. So we get longer days as more light falls on this part of the surface. In the wintertime it's the Southern Hemisphere that gets the majority of light.Equinoxes occur when the axis of...