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Those are the days when the sun reaches the "solstices" ... June 21 and December 21.
On the first day of Northern Hemisphere Summer, the sun is directly overhead at some point on the Tropic of Cancer ... the line around the Earth that's about 23.5° north of the equator. At every other latitude between the equator and the Tropic of Cancer ... all in the northern hemisphere ... the sun is directly overhead twice, on two different days between March 21 and September 21, with June 21 exactly between them. How far the two days are on either side of June 21 depends on the latitude. Right ON the equator, they're March 21 and September 21.
Yes. Most places in the Hawaiian Islands will experience the noon Sun "straight overhead" twice each year. In fact, the phrase "Lahaina Noon" is sometimes used in the Islands to refer to those days on which the Sun reaches the zenith.
First, we need the "transit altitude" of the celestial equator, at 80 degrees north. That's 90 - 80 degrees = 10 degrees. At noon (local apparent noon) the Sun's altitude will be: 10 degrees + the Sun's declination. That's the altitude of the Sun's "upper culmination". At "midnight" (the Sun's "lower culmination") the Sun's altitude will be: the Sun's declination - 10 degrees. So, the difference in altitude is 20 degrees. The Sun is 20 degrees higher at noon.
The two days of the year when the sun is directly overhead at either 23.5 degrees north or south are known as the summer solstice and the winter solstice.
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solstice june 21 and december 21
Each of the two days of the year when the noon sun is overhead at either 23.5 north and south is caled the SOLSTICE
Never. The Sun can only be directly overhead (90 deg altitude) at latitudes between 23.5 deg N and 23.5 deg S. The Sun is directly overhead at a latitude of 23.5 deg N on the summer solstice. On that day it would be at its highest point in the sky for an observer at 27.947 deg N (about 85.553 deg above S horizon), but it would not be directly overhead.
There are only two days of the year is when the sun directly overhead Singapore. This is as a result of being almost at the same latitude as the equator.
It is called a Solstice. I think it's from the latin for 'Stationary Sun'.
It shines directly overhead at noon on June 21-22, usually 1 or 2 days.
In the continental United States, the sun is never directly overhead at noon. The furthest north that the sun can be directly overhead is at the Tropic of Cancer, which is at approximately 23.5°N latitude. This means that only locations south of this latitude, such as parts of southern Florida, experience the sun directly overhead, and even then, it occurs only during the summer solstice, around June 21, for one day.
The Sun is never directly overhead in the Continental US. The Sun's maximum inclination is 23.26 degrees, at the Summer Solstice, but Key West, the southern most point of the Continental US, is 24.5 degrees. It is close, but it is not directly overhead.
The number of days the sun is directly overhead in the continental US varies depending on the location. Generally, it occurs from one to several times a year at latitudes close to the Tropic of Cancer. In more northern states, like those in the lower 48, the sun is never directly overhead.
An observer at a latitude of 79 degrees North will see the Sun at the zenith on the summer solstice, around June 21. This is when the Sun reaches its highest point in the sky and appears directly overhead at noon.