The Daily Parker

Politics, Weather, Photography, and the Dog

Stuff I'll read later

A little busy today, so I'm putting these down for later consumption:

Now, I must prepare...for Whisky Fest!

The BST of times, BBC style

Author Tim Harford, who wrote The Logic of Life and a few other books I've liked, yesterday published an explanation of what telling time is all about:

Water clocks appear in civilisations from ancient Egypt to medieval Persia. Others kept time from marks on candles. But even the most accurate devices might wander by 15 minutes a day. This didn't matter to a monk wanting to know when to pray.

But there was one increasingly important area of life where the inability to keep accurate time was of huge economic significance: sailing.

By observing the angle of the Sun, sailors could calculate their latitude - where they were from north to south. But their longitude - where they were from east to west - had to be guessed.

Mistakes could - and frequently did - lead to ships hitting land hundreds of miles away from where navigators thought they were, sometimes disastrously.

How could accurate timekeeping help? If you knew when it was midday at Greenwich Observatory - or any other reference point - you could observe the Sun, calculate the time difference, and work out the distance.

But does anybody really know what time it is?

Open tabs at lunchtime

Sigh:

I hope to read these articles sometime this year.

 

A few things have happened

Not exactly a slow news day:

And finally, for those of you living in the new, evidence-free world of today, you'll be happy to know that all of these things may have come about because of the lunar eclipse and comet happening Friday night.

Lunchtime links

Stuff I'll read before rehearsal today:

Back to the mines...

Darkest morning of the year

January 3rd is one of my favorite days of the year in astronomy, because it's the day that the northern hemisphere has its latest sunrise of the winter. This morning in Chicago, the sun rose at 7:19 (though it rose behind a thick rainy overcast), just a few seconds later than it rose yesterday. But tomorrow it will rise just a few seconds earlier, then a few more, until by the end of January it'll rise more than a minute earlier each day.

Meanwhile, thanks to the eccentricity of our orbit around the sun, sunsets have gotten later since the first week of December. It's noticeable now; today's sunset at 16:33 is 14 minutes later than the earliest sunset on December 7th. A week from now sunset is at 16:40; a week later, at 16:48.

By January 31st we will see more clearly that the dark days of northern hemisphere winter are ending. Sunrise at 7:04 and sunset at 17:04 gives us 10 full hours of sunlight, 47 minutes more than we'll get today.

So even though the 115th Congress opened today in Washington, with the House Republicans proposing to geld their own ethics watchdog (and why would they want to do that, hmmm?), at least things will literally get more sunny throughout the country every day for the next six months.

Time to fall back

For those of us in the northern hemisphere in places that observe daylight savings time on U.S. rules—that is, for most of the U.S. and Canada—this morning's sunrise was (or will be, west of the Rockies) the latest sunrise until 6 November 2027.

I've got to say, the sun rising around 7:30 has not helped my mornings. Tonight we return to standard time, putting tomorrow's sunrise at 6:30, and making it easier to get out of bed Monday morning.

Of course, from Decmeber 1st to February 4th, the sun will rise after 7 here in Chicago. And by this time next week we'll have less than 10 hours of daylight.

At least I'm not in places along the western edge of a time zone, like Lafayette Landing, Mich., where the sun didn't rise until 8:48 local time this morning. I'd bet they've been ready for a change for weeks now.