- July 4 -

Earth at Aphelion

Aphelion Day is the day that the Earth and Sun are at their furthest distance from each other. Every July the Earth is at aphelion, the furthest from the Sun for the year and in January it is at perihelion, the closest to the Sun for the year.  The Earth's annual orbit around the Sun will...

Earth at Aphelion

Aphelion Day is the day that the Earth and Sun are at their furthest distance from each other. Every July the Earth is at aphelion, the furthest from the Sun for the year and in January it is at perihelion, the closest to the Sun for the year.

The Earth's annual orbit around the Sun will carry it to its furthest point from the Sun – its aphelion – at a distance of 1.02 AU.
The Earth's distance from the Sun varies over the course of the year because its orbit is slightly oval-shaped, following a path called an ellipse. On 5 July, the Earth reaches the point along this ellipse that is furthest from the Sun.
As a result, this moment marks the point in the year when the Sun appears smallest in the sky, and when the Earth receives the least radiation from it. In practice, however, the effect is incredibly small.
The Earth's orbit is almost exactly circular and its distance from the Sun varies by only about 3% over the course of the year, and so other phenomena, such the reflection of solar radiation by clouds, have a much more significant effect in determining our weather.
The annual changes in weather between the summer and winter months are caused entirely by the tilt of the Earth's axis of rotation, rather than by any change in its distance from the Sun.
Source:
http://www.souledout.org/nightsky/aphelionday/aphelionday.html
http://in-the-sky.org/news.php?id=20130705_09_100

Categories:

More holidays on this day:

Independence Day in U.S.
Sidewalk Egg Frying Day

You may also like...

Interesting events from Nature category.

International Plastic Bag Free Day

International plastic bag free day is a global initiative that aims to eliminate or radically reduce the use of single-use plastic bags in the world and to make society aware of the over-consumption of plastic bags and disposable products and work towards developing more responsible and more...

World Nature Conservation Day

Celebrated on July 28 each year, World Nature Conservation Day recognizes that a healthy environment is the foundation for a stable and productive society and to ensure the well-being of present and future generations, we all must participate to protect, conserve, and sustainably manage our natural...

World Ranger Day

World Ranger Day is observed annually on the 31st of July, and is promoted by the 54 member associations of the International Ranger Federation (IRF). The first World Ranger Day was observed in 2007 on the 15th anniversary of the founding of the IRF. Every day park rangers risk their...

Poinsettia Day

December 12th is Poinsettia Day celebrating the beautiful plant we've come to associate with Christmas. The date marks the death of Joel Roberts Poinsett, an American botanist, physician and Minister to Mexico who in 1828 sent cuttings of the plant he'd discovered in Southern Mexico to his home in...

World Energy Conservation Day

World Energy Conservation Day is celebrated on 14th December globally to highlight the importance of energy consumption and its use in our day-to-day life, its scarcity and its impact on sustainability of global eco systems. It focuses our concentration on significant issues facing the future of...

Winter Solstice

The winter solstice is the solstice that occurs in winter. It is the time at which the Sun is appearing at noon at its lowest altitude above the horizon. In the Northern Hemisphere this is the Southern solstice, the time at which the Sun is at its southernmost point in the sky, which usually occurs...

Download KeepIn Calendar

Enjoy the interesting stories even on your phone or tablet