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Autumnal Equinox. After the solstice, the days get shorter and the nights longer. Day and night are approximately equal on the equinox. Mona Evans, "Autumn Equinox" www.bellaonline.c...

Individual images taken of the Sun in one year to create a full curve called an analemma. The summer solstice being at the top, winter solstice at the bottom, and equinox where the lines cross. (Credit: Jesús Peláez)

Florence. St John is the patron saint of Florence and June 24 is a public holiday there. After a day of celebration, in the evening there are fireworks. Here you can see part of the display over the Ponte Vecchio. Mona Evans, "Summer Solstice - St John's Day" www.bellaonline.c...

Festa di San Giovanni: programma del 24 giugno 2013

firenzetoday.it

Chichen Itza, Spring Equinox, 2011-03-20. (Credit: Passagetoroma) The video shows the "descent of Kukulkan/Quetzalcoatl on the steps of the pyramid of El Castillo in Chichen Itza. What makes it rare is that all seven diamonds appear and no clouds interrupt the transition." Mona Evans, "Vernal Equinox" www.bellaonline.c...

Spring equinox 2009 at Chichen Itza, Mexico. A golden snake of light appears to slither down the steps of the pyramid dedicated to Kukulkan, the feathered serpent god. (credit: ATSZ56) Mona Evans, "Vernal Equinox" www.bellaonline.c...

Sunset from near the winter solstice sunset point in Stonehenge. The World Heritage monument dates back to over 4000 years ago. (Image credit & copyright: Pete Glastonbury, The World at Night) Mona Evans, "Winter Solstice" www.bellaonline.c...

Earth at Equinox. 2013-09-22. (Photo: Roscosmos / NTSOMZ/ SRC "Planeta" / zelenyikot. livejournal. com) The Russian weather satellite Electro-L captured this image. The image is in visible light and near infrared. The near IR picks out vegetation and has been given a greenish tint. Mona Evans, "Autumnal Equinox" www.bellaonline.c...

Barents Sea off the northern coast of Norway. Five days before the summer solstice 2013, the Sun hadn't set for just over a month. This picture was taken at an hour past midnight. (Image credit: Ian Ridpath)

Playa de Poniente Beach. 2013.06.24. A full moon (1 day past perigee) rises over the San Juan bonfire on the beach in Gijon. Fires formed by burning unwanted furniture, old school books, wood and effigies of malign spirits are seen across Spain as people celebrate the night of San Juan, a purification ceremony coinciding with the summer solstice. (photo: REUTERS/Eloy Alonso) Mona Evans, "Summer Solstice - St. John's Day" www.bellaonline.c...

Summer solstice celebrations in the Wachau Valley in Austria. (Foto: NÖ Werbung, Catherine Stukhard) Mona Evans, "Summer Solstice - St. John's Day" www.bellaonline.c...

The Old Moon in the New Moon's Arms. Taken on Nowruz, the March 20 equinox, from Esfahan, Iran. (Image Credit & Copyright: M. Taha Ghouchkanlu) Earthshine is Sunlight reflected off the Earth and illuminating the Moon's night side. Mona Evans, "Absolute Beginners - Observing the Moon" www.bellaonline.c...

The celestial sphere. This is a projection into space of the Earth's coordinate system. The ecliptic is the Earth's path around the Sun - it's tilted to the equator because Earth's axis is tilted. Mona Evans "Equinoxes and the Ecliptic" www.bellaonline.c...

Loughcrew Equinox - Knowth, Ireland. The video shows how the equinox sunrise illuminates part of the dark interior of a neolithic stone mound. ©Mona Evans, "Autumnal Equinox" www.bellaonline.c...

Solargraph made with a pinhole camera in 2009. (Image: Becky Ramotowski) It shows the path of the Sun for the six months from the summer solstice - the topmost streak - to the winter solstice - the lowest streak. ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...

Diagram of the June solstice. You can see why in the Arctic Circle (66.5 degrees north) you don't see any sunsets and in the Antarctic Circle, the sun doesn't rise. ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...

Sunrise analemma (2012: April 2-Sept 16). If you mark the Sun's position at the same time each day for a year, it makes a figure 8. This picture shows just half that, almost from equinox to equinox. The Sun is at its highest point at the June solstice and also seems to stand still. If you click to enlarge, you can see a little dot at June 6. That's Venus in transit. (Image credit & copyright: Tunc Tezel) ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...

Equinoxes occur when the Sun crosses the celestial equator. The ecliptic (broken line) is the apparent path of the Sun as the Earth orbits. The celestial equator is the projection of Earth's equator into space as part of a sky coordinate system - like a map grid on Earth. ©Mona Evans, "Autumnal Equinox" www.bellaonline.c...

Harvest moon on the day of the autumnal equinox, Sept. 22, 2010, Douglas County, Oregon. The Moon (and the setting Sun) look red when low in the sky, because the light has traveled through more air. The air particles tend to act as a filter to scatter the bluer light. The Moon also looks bigger when it's low in the sky, but its size doesn't change. (Photo credit & copyright: Robin Loznak) ©Mona Evans, "Autumnal Equinox" www.bellaonline.c...

The Chinese Scholar's Garden, Staten Island, New York. (Photo credit & copyright: Bill Gent) The moon-viewing pavilion overlooking a pond would be a perfect place to celebrate the autumnal equinox Moon. ©Mona Evans, "Autumnal Equinox" www.bellaonline.c...

Loughcrew, Ireland. Megalithic passage tomb aligned to the equinox. On the equinoxes the rising Sun illuminates a decorated backstone within the cairn. (Photo: Michael Fox) ©Mona Evans, "Autumnal Equinox" www.bellaonline.c...

Equinox Sunbeam, Loughcrew, Eire. This megalithic mound was built five thousand or more years ago. The back wall is decorated with symbolic carvings. You wouldn't usually be able to see them, but around the time of the March and September equinoxes the rising Sun illuminates the wall. ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...

Manhattanhenge. (photo: twi-ny/mdr) Twice a year the Sun sets between the skyscrapers of the east-west streets in what astrophysicist Neil de Grasse Tyson dubbed "Manhattanhenge" as the tall buildings are reminiscent of Stonehenge. If the Manhattan street grid were precisely aligned with the compass points, it would occur on the March and September solstices, but it happens in May and July. ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...

Midnight Sun on Altafjord, Alta, Norway. Since Alta is within the Arctic Circle, during the summer months the Sun doesn't set. This picture was taken in July, so it was after the summer solstice. (photo: Vberger) ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...

Why we have seasons. If Earth's axis weren't tilted, day length at any latitude would be the same all year round. This diagram shows the changing seasons in the northern hemisphere. The direction in which the axis points doesn't change as the planet orbits the Sun, so you can see how this affects the amount of sunlight each hemisphere gets during the year. (Diagram: Universe Today) ©Mona Evans, “Why Planets Have Seasons” www.bellaonline.c...