Thursday March 15th 2007, will be the first ride of the year where the sun will still be in the sky at 7:00pm on a thursday while we are meeting at WLC.
I'm glad the days are getting longer again and I can really notice the change. I plotted out the twilight, sunrise, sunset and length of day for the year. Also below is a table with these things for our 2007 Thursday rides.
Joined: 25 Aug 2006Posts: 533Location: here, there, everywhere
woah.
overwhelming.
joeball
Posted: Thu Feb 01, 2007 5:24 pm
Joined: 24 Jul 2005Posts: 6037Location: Ether
piratemolly wrote:
woah.
overwhelming.
Just expand the picture and absorb that. NOtice things like how the sun is up between 8 and 16 hours per day over the course of the year, or how the length of the day changes the least near the summer solitice and winter solstice. The most change occurs near either equinox.
The jump in the plot is daylights saving time, also not that a federal law was passed and effective this year daylights saving time will be extended for more of the year, into November now.
MikeOD
Posted: Thu Feb 01, 2007 5:25 pm
Joined: 04 Feb 2006Posts: 545
A busy day at work I see. What, no moon rise/set/phase data?
Happy Stick Person
Posted: Thu Feb 01, 2007 5:29 pm
Joined: 20 Sep 2006Posts: 1168Location: Leschi
MikeOD wrote:
A busy day at work I see. What, no moon rise/set/phase data?
that would be handy for planing lights out full moon rides!
lieutenantsean
Posted: Sun Feb 04, 2007 1:14 pm
Joined: 10 Oct 2005Posts: 1255
Beware the Ides of March.
_________________ Bringing you Retro-Grouchiness since 1984
Aaron
Posted: Sun Feb 04, 2007 8:20 pm
Joined: 25 Jul 2005Posts: 4645
Am I the only one that doesn't get this chart? What is the line at 2000 hours? Our rides start at 1900. Yellow is the day, right? Why is it listed as sunset? There are 2 dark blue colors yet the morning side is listed as twilight start? Doesn't twilight end in the morning? One could argue that in the summer, twilight never ends because it is always a little light up north. What does the lenght curve mean?
joeball
Posted: Sun Feb 04, 2007 8:41 pm
Joined: 24 Jul 2005Posts: 6037Location: Ether
I'll update the chart, i kind of whipped it out. It's an area chart so the data is plotted along the top each curve defining each area, below that curve is filled in as a solid color except when another "shorter" data set is infront of it. This is why the labels seems bit misleading, they are defined by the upper edge of each area, so sunset is occurring at the end of the day. There are lines at 16:00, 12:00, 8:00, and 4:00 as well they are just behind the plots. I'll put a bold one at 19:00. I also forgot to mention that this data is plotted for Seattle , Washington, so it doesn't concern what is going on up north.
"length" is the length of day.
gsbarnes
Posted: Sun Feb 04, 2007 8:57 pm
Joined: 15 Aug 2006Posts: 2666Location: No Fun Town, USA
One thing that's confusing is that the chart plots two sets of data in one place. The colors indicate the hours of daylight, the red curve indicates amount of daylight. Both use the same vertical axis (4:00, 8:00, 12:00, 16:00, 20:00, 0:00), which kind of works, since these numbers can both indicate the time of day and the length of the daylight (except for 0:00). But it also kind of doesn't work, since it's confusing.
Usually if you're putting two sets of data on the same chart, you include two axes, one on the left side (as it stands), and one on the right (in this case, labeled 'Hours of daylight': 0, 4, 8, 12...), and somehow indicate (in this case) that the red line uses the right axis.
_________________ I have always thought in the back of my mind: Cheese and Onions
gsbarnes
Posted: Sun Feb 04, 2007 9:04 pm
Joined: 15 Aug 2006Posts: 2666Location: No Fun Town, USA
Ick. But that was too negative on my part. I'm interested in this stuff, because just a few days ago I was looking to figure out when I was supposed to transplant some onions this year --- if you didn't know, onions decide to form bulbs based on the length of the day, so if you transplant at the wrong time, they might decide to immediately bulb and you will have teeny little onions, which will make you sad and force you to go buy crappy onions at the store.
So, thanks Andre.
_________________ I have always thought in the back of my mind: Cheese and Onions
All times are GMT - 8 Hours
The time now is Sat Aug 12, 2023 8:11 am
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
Joined: 24 Jul 2005
Posts: 6037
Location: Ether
Joined: 25 Aug 2006
Posts: 533
Location: here, there, everywhere
Joined: 04 Feb 2006
Posts: 545
Joined: 20 Sep 2006
Posts: 1168
Location: Leschi
Joined: 10 Oct 2005
Posts: 1255
Joined: 15 Aug 2006
Posts: 2666
Location: No Fun Town, USA
