In the Northern Hemisphere it's June 21st. In the Southern Hemisphere it's December 21st.
(See the Related question regarding the longest day in 2010.)
The day of a summer solstice
The longest period of daylight happens at the summer solstice. The shortest day occurs at the winter solstice.
In the northern hemisphere, the date of the 2010 summer solstice was 21 June in time zones west of and including UTC+12 and 22 June in time zone UTC+14.
In the southern hemisphere, the date of the 2010 summer solstice was 21 December in time zones west of and including UTC and 22 December in time zones east of and including UTC+1.
That will vary by your location; Cornwall and northern Scotland will have very different day lengths.
You can use the US Naval Observatory's web site to calculate the time of sunrise and sunset for any location, at the link below.
The longest day of the year is the summer solstice. The date changes but is usually June 21, as it was this year (2010). The length of the day varies, depenting on your latitude. The closer you are to either of the poles, the more dramatic the effect of solstices. Where I live, Houston, the daylight lasted from 6:05am - 8:11pm. It really varies.
You can see the effects of latitude on the length of the day by looking up the U.S. Naval Observatory's web site for sunrise and sunset times for an entire year, at the link below. For US locations, select your state and city. For other places in the world, you will need your latitude, longitude and time zone.
If you do not know your latitude and longitude, Google Earth may be the easiest way to look this up.
The Summer Solstice is the longest day in the year - although it is not the day of the earliest sunrise or sunset.
When is the Summer Solstice?
According to the American Heritage Dictionary of the English Language:
In the Northern Hemisphere, the solstice that occurs on or about June 21.
(Read more about the Summer Solstice on Answers.com via the Related link.)
At the north and south poles, each "day" lasts half the year, from the spring equinox to the fall equinox. Near the equator, the day is about 12 hours long, no matter what the date.
For intermediate latitudes, the maximum length of the day is always on the summer solstice, but the duration of that day will depend on the latitude. You can see the length of day for an entire year for any location on the US Naval Observatory's web page, linked below.
June 20th in northern Alaska. [MORE] The common term for the longest day of the year in the northern hemisphere is "summer solstice", which is on June 20 or 21 each year. The shortest day in the northern hemisphere is called "winter solstice", and is Dec 21 or 22 each year. In the southern hemisphere, the longest and shortest days are directly opposite the northern hemisphere's.
All days have the same length, everywhere on earth, namely, 24 hours.
If you're asking about the longest period of time that the sun stays up, that's going to
depend on where you are on earth. Here's a quick, rough summary. These descriptions
assume that there's no air on earth ... air makes the sun appear to rise slightly earlier
than it really does, and set slightly later than it really does. But these quick descriptions
will get the point across:
On the equator:
Longest time the sun is up is 12 hours. Twice a year . . . on March 21 and September 21.
Between the equator and 23.5° latitude, north or south:
Longest time the sun is up is 12 hours. Twice a year.
From March 21 to September 21 if north of the equator.
From September 21 to March 21, if South of the equator.
Between 23.5° and 66.5° latitude, north or south:
Longest time the sun is up varies from 12 hours at 23.5, to 24 hours at 66.5 .
24 hours on June 21, if north of the equator.
24 hours on December 21, if south of the equator.
Between 66.5° and 90° latitude (the pole), north or south:
Longest time the sun is up varies from 24 hours at 66.5 to 6 months at the pole.
North of the equator, 24 hours on June 21, March 21-September 21 at the N pole.
South of the equator, 24 hours on December 21, September 21-March 21 at the S pole.
Around December 22nd. That's in the Southern Hemisphere.
Just for those who may live in that rather obscure area called the Northern Hemisphere, the longest day occurs around June 21st .
All days in the us have 24 hours.
June 21 or 22 is the one with the longest period of daylight, in most of the US.
-- In Hawaii, two days, spaced equally before and after June 21 or 22 ... are
tied for longest.
-- In roughly the northern 1/4 of Alaska, the longest period of daylight is
more than 24 hours, with the exact middle of it on June 21 or 22.
The longest day in any year is the summer solstice. In 2011, this will occur on June 21 in the Northern hemisphere and December 22 in the Southern hemisphere.
Yes. Longest day of the year in one hemisphere, and shortest day of the year in the other hemisphere. So our summer solstice on June 21 is the longest day in Europe or America, but the shortest day for the Australians.
Thanksgiving Day
The longest day of the year in the northern hemisphere is during summer solstice. Th longest day in the year for the southern hemisphere is during winter solstice.
20th June is the shortest day and longest night and it falls on a Sunday, so have a sleep in!
You need to identify: what country you're talking about and how far north the country is.
The longest period of daylight happens at the summer solstice. The shortest day occurs at the winter solstice.
In the Northern Hemisphere it's June 21st. In the Southern Hemisphere it's December 21st.(See the Related question regarding the longest day in 2010.)The day of a summer solstice
21 June
The longest day in any year is the summer solstice. In 2011, this will occur on June 21 in the Northern hemisphere and December 22 in the Southern hemisphere.
the longest
Yes. Longest day of the year in one hemisphere, and shortest day of the year in the other hemisphere. So our summer solstice on June 21 is the longest day in Europe or America, but the shortest day for the Australians.
10-10-10
June 21
Mothers day was on March 14 2010, in England.
Thanksgiving Day
Because it is the shortest day of the year.