Editing 2542: Daylight Calendar

{{comic
| number    = 2542
| date      = November 15, 2021
| title     = Daylight Calendar
| image     = daylight_calendar.png
| titletext = Could be worse. In some towns north of here, it's already December, and the 21st will last for nearly a week.
}}

==Explanation==
At the time of this posting, the United States had ended {{w|Daylight Saving Time}} (DST) recently, on November 7, and returned to standard time. Daylight saving time is a practice of setting clocks ahead by 1 hour during warmer months to effectively 'borrow' some of the typically unused early morning light and pass it down to the late evening where more people can make use of it. In the United States, daylight saving time starts on the second Sunday in March and ends on the first Sunday in November. 

A result of ending of daylight saving time is the sun setting earlier than people are used to, as people have become acclimatized to the shifted clocks &mdash; though it does mean an 'extra' hour of light has returned to the seasonally redarkening mornings. The start of the comic may be the start of a typical comment about how the sun seems to set earlier than usual in November; which it does anyway (north of the equator) but the clock-shift makes it even more obvious. 

In this comic, however, Randall turns the normal talk about DST on its head by devising a [[:Category:Calendar|calendar system]] where the dates "change" based on 12 hours of daylight. This causes shorter "days" in the summer months, which may get more than 12 hours of daylight in a "solar day" and longer "days" in the winter months which would have fewer hours of daylight in a "solar day". As mentioned in the title text, this change would be very pronounced near the poles, which may only get a few hours of daylight per 24 hours in the winter, but conversely may get 20 or more hours of daylight per 24 hours in the summer. Cueball says that he likes the new calendar system, as it gives him more "time" in the winter to complete work - if Cueball is given "3 days" to complete a task, each of those days could be longer than a typical 24 hours. However, this would be reversed in the summer, as each day would be shorter. Also, if this calendar system would be in place, his boss could resolve this problem by just giving him 72 hours to complete his task instead of "3 days".

At temperate latitudes and above, as the calendar goes towards winter (for your hemisphere) the length of daylight per daily cycle shortens. Instead of having "long summer days" (i.e. periods of daylight) and shorter ones in the winter, but still the artificial pressures of a regulated 24-hour cycle to adhere to, the proposal seems to be that the date gets incremented whenever (and ''only'' when) twelve hours of daylight have passed.

In the summer, a day-count starting at sunrise could require a late-afternoon switch to 'tomorrow', which would in turn be switched earlier still the next day as it was already partly used up, with possibly two date-changes per astronomical day (early morning and mid-evening, for example). As winter draws on, not enough daylight will pass to guarantee a date-change in any single period. On the day of this comic's release - November 15, 2021 - Massachusetts, where Randall lives, gets ten hours and forty five minutes between {{w|civil twilight}}s. It is possible that the last day-mark was late during the previous daylight cycle and the next one won't be until early in the following one.

Exactly how the time is marked is not fully explained. Starting each day-period at 00:00 would be easiest, but could be a psychological step too far. One possibility is to set a nominal 00:00 six hours before a day-change, in line with an 'idealized' twelve-hours-of-daylight day, but disregard hours 'belonging' to a prior daylight period. Then keep the clock running (throughout any intervening nights and into the next daylight as necessary) until the date clicks over and realigns as necessary. Clock times would not reach 23:59 for most of the summer, and could far exceed that in the winter. Megan's clock has reached 26:15, by this sunset, and may well be due to be far into the 30-hours range before more daylight and the moving on to the new date and reset time, if not beyond.

The title text relates to how days pass with respect to latitude. Depending on how exactly daylight is measured, we may have more "days" in a year than the usual 365, since refraction of light near the horizon means that the sun is visible slightly more than 50% of the year on average. This effect is strongest near the poles, since the sun spends more time near the horizon. In addition, due the Earth's elliptical orbit, more northerly parts of the Earth receive more sunlight than southerly parts. Combined, these effects mean that a year at the north pole is 381 "days", compared to 369 at the Equator. 

This increase in the number of 'days' with latitude creates a situation where more northerly latitudes pass through the 'months' faster than lower latitudes, as beyond the Arctic circle, twelve hours of daylight would be accumulated upto twice per traditional day during the summer, while being effectively on hold for much of the other six months. This effect would be less pronounced outside the Arctic Circle but still create an acceleration in the passage of dates.

This creates the situation described in the title text, where towns north of Cueball's current location had increased daylight during the summer and hence accelerated through the calendar, and are currently in the '21st of December' at their latitude during winter, when periods of darkness are much longer, causing the time needed to change the date take nearly a week. This implies that they receive about 2 hours of sunlight every day in order to gain the required amount of sunlight in the timeframe given.

==Transcript==
:[Megan is looking down at her phone which she holds up in her hand, while Cueball stands next to her.]
:Megan: Ugh, I hate November. It's 26:15 and the sun is setting ''again!''
:Megan: 3-day days are the worst.
:Cueball: I like it. I know it's dark, but it's nice to have the extra time on deadlines.

:[Caption below the panel:]
:In our new calendar system, the date changes after every 12 hours of daylight, regardless of how long that takes.

{{comic discussion}}

[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]
[[Category:Calendar]]
[[Category:Daylight saving time]]