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Articles about Seasons (30)

September Equinox

The Sun shines directly at the Equator on the September equinox and the length of day and night is nearly equal, but not quite. more

What Is a Leap Year?

A leap year has 366 days, as opposed to a common year, which has 365. Nearly every four years is a Leap Year, and we add a leap day, an extra day on February 29. more

December Solstice

The December solstice is also known as the summer solstice in the Southern Hemisphere and the winter solstice in the Northern Hemisphere. more

When is Fall Equinox?

The fall (autumnal) equinox in the Northern Hemisphere is in September. In the Southern Hemisphere it's in March. more

What is June Solstice?

The June solstice is the longest day of the year in the Northern Hemisphere & the shortest day in the Southern Hemisphere. more

When is Spring Equinox?

The Vernal (Spring) Equinox in the Northern Hemisphere is in March. In the Southern Hemisphere it's in September. more

March Equinox

The March equinox around March 20-21 is the spring (vernal) equinox in the Northern Hemisphere and fall (autumnal) in the south. Night and day are nearly the same length. more

Equinox: Equal Day & Night?

Equinoxes don't have exactly 12 hours of day and night all over the world, like many believe. Such days do happen, but depend on the latitude of your city. more

Chinese Leap Month

Instead of adding one leap day on February 29 nearly every four years, the Chinese add a leap month every 3 years to keep their calendar in line with the Earth's rotation. more

The Ethiopian Leap Year

A leap year occurs every four years in the Ethiopian calendar, when one extra day is added at the end of the year. more

Zodiacal lights

Also known as false dawn, zodiacal lights are rare optical phenomena that occur around sunset and sunrise in early spring and late fall. more

Bahá'í Leap Year

The Bahá'í leap year occurs when five extra days are added between the last two months of the calendar. Leap years usually occur every four years. more

Equation of Time

Why doesn't the year's earliest sunset occur on the Winter Solstice, even though it is the shortest day of the year in terms of daylight? more

Midnight Sun

Midnight Sun, or Polar Day, means that at least a sliver of the Sun's disk is visible above the horizon 24 hours of the day. more

Earth's Orbit & Solstice

The Earth's closest approach to the Sun 2 weeks after the December solstice is a coincidence and has no special significance. more

What are Polar Nights?

A Polar Night is a night that lasts for at least 24 hours. It's the opposite of Midnight Sun / Polar Day. more

A Year Is Never 365 Days

The definition of a tropical year, also known as a solar year, astronomical year, or equinoctial year, is the time it takes the Earth to complete a full orbit around the Sun, and it is approximately 365.242189 days long. more

What is a Black Moon?

It can be the 3rd New Moon in a season of 4 New Moons or the second New Moon in a calendar month. The next Black Moon is in October 2016. more

Full Moon names

Find out Full Moon names and their meanings by month and seasons, common in many North American cultures. more

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