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
Articles About Seasons (43)
Chinese Leap Month
Instead of adding one leap day on February 29 nearly every four years, the Chinese add a leap month every three years to keep their calendar in line with the Earth's rotation. more
The Ethiopian Leap Year
A leap year occurs every 4 years in the Ethiopian calendar when one extra day is added at the end of the year. more
Defining Seasons
When do seasons begin and end in the two hemispheres? 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
December Solstice
The December solstice is the summer solstice in the Southern Hemisphere and the winter solstice in the Northern Hemisphere. more
The Ethiopian Calendar
The Ethiopian calendar is quite similar to the Julian calendar, which was the predecessor to the Gregorian calendar most countries use today. more
10 September Equinox Facts
10 things you may not know about the September Equinox. more
The Gregorian Calendar
The Gregorian calendar is the internationally accepted civil calendar that was first adopted in 1582. more
June Solstice
The June solstice is the longest day of the year in the Northern Hemisphere & the shortest day in the Southern Hemisphere. more
June Solstice Traditions
In many Northern Hemisphere cultures, the June solstice is associated with holidays, feasts and celebrations. more
The March Equinox
The March equinox is the spring (vernal) equinox in the Northern Hemisphere and fall (autumnal) in the south. Night and day are nearly the same length. more
March Equinox customs
Learn more about the customs, traditions and events surrounding the March Equinox. more
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
September Equinox Customs
Folklore, customs, traditions and holidays surrounding the September equinox. 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
When Is Summer Solstice?
The summer solstice in the Northern Hemisphere is in June, while in the Southern Hemisphere, it's in December. more
December Solstice Facts
10 things you may not know about the December Solstice, the shortest day of the year in the Northern Hemisphere. more
March Equinox Facts
On Wednesday, March 20, 2019, the day and night are of almost equal duration in most time zones in the world. more
When Is Winter Solstice?
The Winter solstice in the Northern Hemisphere is in December, while in the Southern Hemisphere, it's in June. more
Earth Is Tilted
When an object the size of Mars crashed into the newly formed planet Earth around 4.5 billion years ago, it knocked it over and left it tilted at an angle. 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
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
June Solstice Facts
11 things you may not know about the June Solstice. 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
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
What Causes Seasons?
Seasons change because Earth's rotational axis tilts away or towards the Sun during the course of a year. more
A Year Is Never 365 Days
The definition of a tropical year is the time it takes the Earth to complete a full orbit around the Sun. It is approximately 365.242189 days long. 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
November: Beaver Moon
The Full Moon in November is named after beavers. It is also called Frost Moon and Mourning Moon, depending on the winter solstice. more
July: Buck Moon
The Full Moon in July is the Buck Moon. Is is also called Thunder Moon, Hay Moon, and Wort Moon. more
December: Cold Moon
The December Full Moon is called the Cold Moon, Long Nights Moon, the Moon before Yule, Oak Moon, and Wolf Moon. more
May: Flower Moon
The Full Moon in May is known as the Flower Moon. Other names include the Corn Planting Moon, and the Milk Moon, while some named it the Hare moon. more
September: Harvest or Corn Moon
The September Full Moon is usually the Harvest Moon, but this depends on the equinox. It is also called Full Corn Moon or Barley Moon. more
Full Moon Names
Full Moons had given names in many ancient cultures. The Full Moon names we use today often reflect nature like Harvest Moon. more
Harvest Moon in September or October?
The Harvest Moon varies between September or October in the Northern Hemisphere. It is the Full Moon nearest the autumnal (fall) equinox. more
October: Hunter's or Harvest Moon
Every third year, October’s Full Moon, the Hunter’s Moon is also the Harvest Moon. It's also called Travel Moon, Dying Grass Moon, Blood Moon, or Sanguine Moon. more
April: Pink Moon
Pink Moon comes from Pink Wild Ground Phlox which bloom in spring. Other names for this Full Moon are Sprouting Grass Moon, Fish Moon, Hare Moon, Egg Moon, and Paschal Moon. more
February: Snow Moon
The February Full Moon is named after the snow on the ground. Some Native American tribes named this the Hunger Moon, others called it the Storm Moon. more
June: Strawberry Moon
The wild strawberries that start to ripen during early summer gave name to the Full Moon in June. Other names are Rose Moon, Hot Moon, and Mead Moon. more
August: Sturgeon Moon
The Full Moon in August is named after the lake sturgeon. Other names for this Full Moon include Grain Moon, Green Corn Moon, Fruit Moon, and Barley Moon. more
January: Wolf Moon
The January Full Moon is named after howling wolves. In some cultures, it was known as Old Moon, Ice Moon, Snow Moon, and the Moon after Yule. more
March: Worm Moon
The Full Moon in March is the Worm Moon. It is also called Lenten Moon, Crow Moon, Crust Moon, Chaste Moon, Sugar Moon, and Sap Moon. more
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