# What affects the amount of sun at a given location?

## What affects the amount of sun at a given location?

The more slanted the sun’s rays are, the longer they travel through the atmosphere, becoming more scattered and diffuse. The 23.5° tilt in the Earth’s axis of rotation is a more significant factor in determining the amount of sunlight striking the Earth at a particular location.

## How the sun affects the earth?

Nothing is more important to us on Earth than the Sun. Without the Sun’s heat and light, the Earth would be a lifeless ball of ice-coated rock. The Sun warms our seas, stirs our atmosphere, generates our weather patterns, and gives energy to the growing green plants that provide the food and oxygen for life on Earth.

## What is the term for how the sun strikes the Earth at any given location?

The angle of sunlight when it strikes Earth’s surface—called the angle of incidence—makes a big difference. The amount of insolation varies depending on latitude, the time of day, the time of year, and atmospheric conditions. Think about how a beam of light from a flashlight changes depending on its angle.

## Why do different places on the Earth receive different amount of sunlight?

Different parts of Earth’s surface receive different amounts of sunlight. Because of the Earth’s tilt the sun’s rays strike the surface at a slant at the poles; they are less focused. This spreads the rays over a wide area. Because the sun’s rays hit at a slant, the area is heated less.

The equator

Yuma

Northern Norway

Norway

Iranian

June 20

## Are days exactly 24 hours?

On Earth, a solar day is around 24 hours. However, Earth’s orbit is elliptical, meaning it’s not a perfect circle. That means some solar days on Earth are a few minutes longer than 24 hours and some are a few minutes shorter. On Earth, a sidereal day is almost exactly 23 hours and 56 minutes.

## Is Earth’s rotation period of about 23 hours and 56 minutes?

Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes, and 4 seconds with respect to other, distant, stars (see below). Earth’s rotation is slowing slightly with time; thus, a day was shorter in the past.

## Why is one day and one night on the Earth of 24 hours?

Why Does Earth Have Day and Night? Once every 24 hours Earth turns — or rotates on its axis — taking all of us with it. When we are on the side of Earth that is facing the Sun, we have daylight. As Earth continues its spin, we are moved to the side facing away from our Sun, and we have nighttime.

## How long was a day when the Earth first formed?

1.7 billion years ago the day was 21 hours long and the eukaryotic cells emerged. The multicellular life began when the day lasted 23 hours, 1.2 billion years ago. The first human ancestors arose 4 million years ago, when the day was already very close to 24 hours long.

Greenwich

## What is the first place to start a new day?

The first major cities to experience a new day are Auckland and Wellington, New Zealand (UTC+12:00; UTC+13:00 with daylight saving time). A 1994 realignment of the IDL made Caroline Island one of the first points of land on Earth to reach January 1, 2000, on the calendar (UTC+14:00).

Howland Island

## Is 12am the start of a new day?

Midnight is usually defined as 12:00:00 a.m., even though logically it’s neither “ante-meridiem” nor “post-meridiem”. In fact a new day is usually defined as beginning at 12 a.m. exactly, even though no time has elapsed in the new day at that time.

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