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==Explanation== | ==Explanation== | ||
− | The picture is divided in 24 segments representing the 24 hours of the day. At noon and midnight | + | {{incomplete|There is a debate about how far {{w|Moscow Time}} is. Russians say that it is UTC+3:00, but others say it is UTC+4:00; who is correct?}} |
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+ | The picture is divided in 24 segments representing the 24 hours of the day. At noon and at midnight the break between segments is indicated by the tip of a dark grey triangle. | ||
− | The picture rotates by 3.75 {{w|degree (angle)|degrees}} every 15 minutes, as does the Earth so that it is constantly up to date in showing which regions are currently at which times of day. The picture change seems to happen | + | The picture rotates by 3.75 {{w|degree (angle)|degrees}} every 15 minutes, as does the Earth, so that it is constantly up to date in showing which regions are currently at which times of day. The picture change seems to happen half-way through a 15-minute time increment (that is, at 7½, 22½, 37½, and 52½ minutes after each hour), so that the picture is always correct for the nearest multiple of 15 minutes. |
− | The map projection of the earth in the middle of the picture shows an {{w|azimuthal equidistant projection}} with the {{w|South Pole}} in the center. This is unusual, as | + | The map projection of the earth in the middle of the picture shows an {{w|azimuthal equidistant projection}} with the {{w|South Pole}} in the center. This is unusual, as the projection typically puts the north pole in the center, but necessary in order for it to rotate clockwise. [[Randall]] was playing on projections before in [[977: Map Projections]]. |
− | The list of cities and countries doesn't match the map exactly - notice how the continent of Australia is shifted counterclockwise of the words "most Australian cities". This is because the map is centered relative to the {{w|time zone}}s and the local variations. The map shows the configuration of time zones | + | The list of cities and countries doesn't match the map exactly - notice how the continent of Australia is shifted counterclockwise of the words "most Australian cities". This is because the map is centered relative to the {{w|time zone}}s and the local variations therein. The map shows the configuration of time zones with respect to {{w|daylight saving time}} (also known as summer time) at the time of the comic's initial release (February 2014); it was being observed in parts of Australia, New Zealand, Brazil, and other countries not named in this comic. If the map were to stay accurate through the year, the location of place names would have to move over the next few months as parts of the southern hemisphere went off DST and parts of the northern hemisphere went onto it; however, the map failed to change on the morning of March 9 as it should have (to recognize the start of DST in North America). |
− | In many countries "{{w|business hours}}" are considered to be from 9 am to 5 pm. With some exceptions, including emergencies, it is generally considered rude to place a {{w|telephone}} call to someone's residence when most people are asleep; Randall portrays this period as extending from 10 pm to 8 am. This may be a reference to the 10 pm "cutoff" time [http://www.youtube.com/watch?v=L0WeQJW-H3Y discussed] in an episode of "Curb Your Enthusiasm." | + | In many countries "{{w|business hours}}" are considered to be from 9 am to 5 pm. With some exceptions, including emergencies, it is generally considered rude to place a {{w|telephone}} call to someone's residence during the hours when most people are asleep; Randall portrays this time period as extending from 10 pm to 8 am. This may be a reference to the 10 pm "cutoff" time [http://www.youtube.com/watch?v=L0WeQJW-H3Y discussed] in an episode of "Curb Your Enthusiasm." |
− | "Rude to Call" was also the name used by a G-mail experimental opt-in feature in 2009 which added a crossed | + | "Rude to Call" was also the name used by a G-mail experimental opt-in feature in 2009 which added a crossed out phone symbol next to the sender if it was night in the sender's time zone when the reader loaded the email on their screen. |
− | + | On midnight at UTC we can see this situation: | |
*00:00 UTC {{w|Greenwich Mean Time}} | *00:00 UTC {{w|Greenwich Mean Time}} | ||
::UK, Portugal | ::UK, Portugal |