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==Explanation== | ==Explanation== | ||
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| + | {{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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| + | --> That's not the debate. The comic was published when Moscow was technically assigned +4 (+3 permanent DST). Since then it has become +3 (with no DST applied). The explanation describes the comic image as it still is, but now also mentions the subsequent changes in reality. This really ought to satisfy all parties. For it to be incomplete, that must only be because even more fine change-info could be added (for Moscow or elsewhere). Please do add/insert any other such changes that you know not to be there in the original. But it is not incomplete for the reason given, so I'm 'hiding' that and giving this long-form justification for those who have a deep interest in *why* but don't care to check the page history for edit summaries and other to-and-fros. - Randall Munroe | ||
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The picture is divided in 24 segments representing the 24 hours of the day. At noon and midnight, the break between segments is indicated by the tip of a dark grey triangle. | The picture is divided in 24 segments representing the 24 hours of the day. At noon and 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 halfway 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 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 halfway 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 {{ | + | The map projection of the earth in the middle of the picture shows an {{w|azimuthal equidistant projection}} with the {{South Pole}} in the centre. This is unusual, as the projection typically puts the north pole in the centre, but necessary 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 | + | 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 centred relative to the {{w|time zone}}s and the local variations. The map shows the configuration of time zones concerning {{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 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." | ||
