The Daily Parker

Via the IANA Time Zone Database mailing list, through Randy Olson, comes this map showing the difference between local solar time and what wall clocks show throughout the world:

At the time I’m writing, near the winter solstice, Madrid’s sunset is around 17:55, more than an hour later than the sunset in, for example, Naples, which is at a similar latitude. The same difference holds at the summer solstice and around the year. Just because it applies to most places I’ve been, a time like that in Naples feels more natural to me, and probably to most non-Spanish people. But is it?

Looking for other regions of the world having the same peculiarity of Spain, I edited a world map from Wikipedia to show the difference between solar and standard time. It turns out, there are many places where the sun rises and sets late in the day, like in Spain, but not a lot where it is very early (highlighted in red and green in the map, respectively). Most of Russia is heavily red, but mostly in zones with very scarce population; the exception is St. Petersburg, with a discrepancy of two hours, but the effect on time is mitigated by the high latitude. The most extreme example of Spain-like time is western China: the difference reaches three hours against solar time. For example, today the sun rises there at 10:15 and sets at 19:45, and solar noon is at 15:01.

If you live in the green areas of the map, the sun tends to rise and set earlier than in the red zones. Not coincidentally, the places that set time policy tend to be neutral: London, Washington, Sydney, Beijing, Ottawa...they're all nearly dead-center in their respective zones. The notable exception is Moscow, where time policy goes back and forth and may even change once more this year.

Finally, a commenter on the Reddit MapPorn post where this also appeared points out: "Fun fact: The small Afghan-Chinese border is the largest jump in timezone in the world. (3 and a half hour difference on each side) You'd get jet lag crossing that border."

Here's the semi-annual Chicago sunrise chart . (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx .)

Sunrises are just starting to get earlier, but today's (7:18 CST) is only a few seconds earlier than the latest sunrise of the year on January 3rd. Even though the sunrise times creep earlier by seconds every day, sunsets start to get noticeably later: 16:39 today, 7 minutes later in a week, 25 minutes later in three weeks. January is cold and dark, but (on average) a few degrees warmer and 48 minutes longer when it ends than when it begins.

You can get sunrise information for your location at wx-now.com.

It's cold in Chicago right now: -7°C with a wind chill of -13°C and gradual cooling predicted towards a low of -16°C Wednesday night. This is only the second time in 30 years it's been so cold, so early.

Two things: first, though I don't have time to link to anything right now, it turns out this cold in Chicago is caused by abnormally warm temperatures in the North Pacific. So, yeah, aggregate global warming causes localized cold snaps.

Second, thanks to celestial mechanics, tonight's sunset will be later than last night's for every point on earth that has a sunset. (Inside the Arctic and Antarctic circles, there are no sunsets today.) Sunsets continue to get later everywhere until well past the March equinox, even though sunrises in the Northern Hemisphere will also get later until January 6th. (See the Chicago sunrise chart for details.)

So, despite this really unpleasant weather, there are definite signs it will get warmer soon. Relatively soon, anyway.

Since we moved the end of Daylight Saving Time to the first week of November, sunrises at the end of October are later than those in mid-December. Yesterday's sunrise was the latest sunrise in a year, and will be the latest until 2016. (The sunrise on 6 November 2010 was the latest until 2021, so it really could be worse.)

In Chicago this morning, the sun rose at 6:26, the same time it rose on September 12th. It won't rise this early again until March 3rd—but then a week later we shift the clocks again so we get another 6:26 sunrise on April 6th.

National Geographic had not one but two articles on DST this weekend. Any conclusions? Some people don't like it and others do. The only conclusion I draw from reading both is whether DST benefits you depends on a lot of factors, geography preponderating.

I still don't know why we moved the fall switch from end of October to beginning of November in 2007. We want daylight for Hallowe'en? I really, really hate getting up before dawn, which wouldn't happen before Thanksgiving if we still used the pre-1986 (1st Sunday in October) rules; even the 1986-2006 regime (4th Sunday in October) would minimize it. Europe, including the UK, change their clocks the last Sunday in September and the last Sunday in March. That seems to work best for northern, cool climates—like Chicago. Maybe Illinois should go its own way, then?

The week between when we used to switch back to Standard Time and when we do so now (since 2007) makes me want to stay in bed.

This morning sunrise happened at 7:18 and will slouch out to 7:25 on Saturday morning. It's the latest sunrise we'll have for three years, and it's 45 minutes after I usually get up in the morning.

I know a lot of people prefer more light in the afternoon. I don't care, really. Sunday the sun sets at 16:42; but it rises at 6:26, and gives me another month before the sun rises after 7 again. Then, of course, there's the slog from December 2nd to February 4th...but what can you do?

Just having a moan. You can ignore this post.

Here's the semi-annual Chicago sunrise chart. (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx.)

You can get sunrise information for your location at wx-now.com.

Even though we've just gotten our first snowfall, and today has started giving us snow, freezing rain, sleet, and icy roads, there is good news.

January 27th is when things officially start looking brighter in Chicago every year. Tonight, for the first time in almost two months, the sun sets at 5pm. Then things start to become noticeably brighter: a 7am sunrise next Monday, a 5:30pm sunset two weeks after that, then a 6:30am sunrise less than a week later.

Yes, this is dorky, but trust me: you'll notice it now.

Here's the semi-annual Chicago sunrise chart. (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx.)

You can get sunrise information for your location at wx-now.com.

Late next year, Earth could get the best show from a comet in decades:

By the end of summer [Comet Ison] will become visible in small telescopes and binoculars. By October it will pass close to Mars and things will begin to stir. The surface will shift as the ice responds to the thermal shock, cracks will appear in the crust, tiny puffs of gas will rise from it as it is warmed. The comet's tail is forming.

Slowly at first but with increasing vigour, as it passes the orbit of Earth, the gas and dust geysers will gather force. The space around the comet becomes brilliant as the ice below the surface turns into gas and erupts, reflecting the light of the Sun. Now Ison is surrounded by a cloud of gas called the coma, hundreds of thousands of miles from side to side. The comet's rotation curves these jets into space as they trail into spirals behind it. As they move out the gas trails are stopped and blown backwards by the Solar Wind.

By late November it will be visible to the unaided eye just after dark in the same direction as the setting Sun.

I expect we'll hear more about this as it gets closer.

I'm a little late getting the semi-annual Chicago sunrise chart out this summer. Sorry. (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx.)

You can get sunrise information for your location at wx-now.com.