The Earliest Spring of our Lives

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Spring Comes Early

Spring will be off to a very early start in 2016, thanks to leap day weirdness! Have you noticed that the equinox used be on the 21st? This year, spring begins March 19 or 20, depending on your time zone.

February 29 has consequences that affect more than just being the rarest birthday. ​ Let’s back up …

The calendar is nearly as perfect. Time is something we humans do perfectly. Atomic clocks divide each second into 9,192,631,770 parts, and the superaccurate time is then transmitted to anyone with a phone (303-499-7111) or web access (http://www.time.gov/) or a GPS or a smartphone.

But consider the year 2000. That February, for the first time in four centuries, a year divisible by 100  did NOT skip the leap year. Meaning, there WAS a February 29 that year.

So what? Well, remember how our Gregorian calendar works? Years divisible by four are leap years. But if a year is also divisible by 100, it SKIPS the leap year. Thus, 1700 and 1800 and 1900 did NOT have a February 29. (Hang in there.)

But our calendar system decrees that if a year is divisible by 400, it WILL be a leap year, so 2000 was the first century year with a leap day since Galileo grew a beard. The consequence of that little move will affect us during this next month.

You see, equinoxes and solstices happen earlier and earlier as each century wears on. We can’t let that continue, so that skip of the leap year in 1700 and 1800 and 1900 each created a sudden “jump” of one day. Bingo: those “first day of summers” and the other seasons got pushed back a day, which is all part of the plan. Generally, equinoxes and solstices happen on the 21st (except the fall equinox, which is on September 23rd).

But in 2000, omitting the usual century leap year prevented the calendar from jumping back. Solstices and equinoxes instead kept creeping earlier. In case you haven’t noticed, Spring began on March 21 when you were little but it’s been falling on the 20th for some years now. Well, in a few weeks, it’ll happen on March 19th for most US and Canadian time zones. Later this century, it’ll happen on the 19th every year.

To conclude? This will be the earliest spring since 1896!

Why Spring Begins Early This Year

It all happens because the number of days in a year isn’t even. A year lasts 365 days, 5 hours, 48 minutes, and 46 seconds. Call it 365.2422 days. If only the year were 11 minutes longer, or 365.25000 days, we could simply add one day every fourth year and take care of the fraction forever.

equinox_0_full_width.png

But because Earth spins a hair less than 365 ¼ times per year, we must sometimes omit that extra once‑every‑four‑year day, and that’s what creates all this fussing. Skip three leap years every four centuries and you’re accurate to one day in about 3300 years. (We even deal with THAT little glitch by skipping February 29 in the year 4000.)

A calendar that doesn’t accurately divide days into the year starts going weirdly out of sync. Seasons start happening at odd times. In the previous Julian calendar (where all century years were leap years) the annual 11‑minute error accumulated to where equinoxes were happening around March 11. The Easter Bunny was hopping around in the snow!

The present calendar takes care of everything. This leap year will make 2016 have the earliest seasons of our lives (thus far!).

~ By  Bob Berman

About This Blog

Welcome to “This Week’s Amazing Sky,” the Almanac’s blog on stargazing and astronomy. Wondering which bright objects you’re seeing in the night sky? Want to learn about a breathtaking sight coming up? Bob Berman, longtime and famous astronomer for The Old Farmer’s Almanac, will help bring alive the wonders of our universe. From the beautiful stars and planets to magical auroras and eclipses, we’ll cover everything under the Sun (and Moon)!

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Julian calendar and snowy Easter

If under the Julian calendar the easter bunny was hopping around in the snow, why are those who keep the Julian calendar celebrating easter in late April and those who use the Gregorian calendar celebrating on March 27, "in the snow"?

Love this grew up with the

Love this grew up with the almanac, thank you.

This is there only page I can

This is there only page I can find that says it starts in the 19th All others are saying the 20th

Mimi's comment

Based on GMT, the equinox is on 3/20. This article relates to the date that most readers will be experiencing when the equinox occurs. As I type, it is morning in Nashville, but afternoon in New York (EDT) and London (GMT).

Thanks. Here are the 2016

Thanks. Here are the 2016 Equinox Dates and Times:

The spring equinox arrives on Saturday, March 19 or Sunday March 20, 2016, depending on your time zone:

Saturday, March 19, 2016 at 9:30 PM PDT
Saturday, March 19, 2016 at 10:30 PM MDT 
Saturday, March 19, 2016 at 11:30 PM CDT
Sunday, March 20, 2016 at 12:30 AM EDT
Sunday, March 20, 2016 at 04:30 UTC (Universal Time)​

See our main page on “First Day of Spring: Vernal Equinox.

earliest spring

Great article. Made it easy to understand. Interesting how they came up with all this in the days even before electricity.

equinox.

A year lasts 365 days, 5 hours, 48 minutes, and 46 seconds. This means the equinox is constant. Easter is calculated as the first Sunday after the first full moon after the equinox, this doesn't matter what calendar you are using. So, the March 11 date in question in the article is irrelevant. If there is a record of the area still receiving snow after the equinox the Easter Bunny still has a chance of hopping on snow.

Easter and the vernal equinox

Thank you for your feedback. The Easter bunny comment was meant to add a little bit of humor, but technically you are correct. Easter is not directly related to when the Gregorian calendar marks the time of the vernal equinox. Christian churches that follow the Gregorian calendar, such as many Western Christian churches, celebrate Easter on the first Sunday after the paschal full Moon on or just after the ecclesiastical vernal equinox. For simplicity, for church purposes, the equinox is considered March 21 (a fixed spring date set by the church) though the actual vernal equinox does not always occur on that day in the Gregorian calendar. The paschal full Moon always falls on the 14th day of a lunar month; because ancient calculations (made in a.d. 325) did not take into account certain lunar motions, it may differ from the actual full Moon date by a day or so. In Christian churches that follow the Gregorian calendar for determining the date of Easter, the observance can never occur before March 22 or after April 25.

Calendar

Why do we not have 13 months of 28 days instead of 12 odd ones?

12 vs 13 months

The reason we don't have 13 months of 28 days each is to keep a month more or less in sync with the phases of the moon. A lunation is 29 days 12 hours 44 mins and 3 seconds. Yes, our 12 month calendar is 11 days off as far as the moon goes, but a 13 month calendar would make it 18 days "wrong".

plant and flowering veg for flowers

Thank you so much , my grandmother always with by this and the moon.

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