by apodman » Fri Aug 01, 2008 10:00 pm
neufer wrote:apodman wrote:I rounded to the nearest degree.
Well, that's no fun.
Which prime meridian are you closest to?
My meridian is 0° 0' 43.4" west of the Capitol.
My meridian is 0° 1' 6.26" east of the White House.
So the Capitol wins.
Note that I'm advertising more digits of resolution here than I actually have. The .01-arc-second longitude resolution for the White House is less than a foot. I have no such resolution at my own location and can't vouch for the third-party address converter I used, so I use the term "my meridian" more loosely than the quoted digits suggest.
See, I didn't round very much at all to get down to an even 77°.
I also rounded barely more than an arc-minute to get down to 39°N.
77° and 39° are close enough for my everyday purposes, and I get sloppier yet to save a few keystrokes. When I visit one of my favorite links (
Complete Sun and Moon Data for One Day from the folks at the previously mentioned
US Naval Observatory), I just use the default (District of Columbia: 77.0°W, 38.9°N) and click once to get my sunrise and sunset. It takes at least 2 minutes between the time the Sun touches the horizon and the time it totally disappears, so why ask for greater accuracy when I don't even know which part of the sunset the quoted time represents.
neufer (quoting Wiki) wrote:Many western states have borders that are meridians of "longitude west of Washington", that is, west of the legal 1850 meridian through the Old Naval Observatory [77°3'2.3"W].
My education continues.
[quote="neufer"][quote="apodman"]I rounded to the nearest degree.[/quote]
Well, that's no fun.
Which prime meridian are you closest to?[/quote]
My meridian is 0° 0' 43.4" west of the Capitol.
My meridian is 0° 1' 6.26" east of the White House.
So the Capitol wins.
[color=red]Note that I'm advertising more digits of resolution here than I actually have. The .01-arc-second longitude resolution for the White House is less than a foot. I have no such resolution at my own location and can't vouch for the third-party address converter I used, so I use the term "my meridian" more loosely than the quoted digits suggest.[/color]
See, I didn't round very much at all to get down to an even 77°.
I also rounded barely more than an arc-minute to get down to 39°N.
77° and 39° are close enough for my everyday purposes, and I get sloppier yet to save a few keystrokes. When I visit one of my favorite links ([url=http://aa.usno.navy.mil/data/docs/RS_OneDay.php]Complete Sun and Moon Data for One Day[/url] from the folks at the previously mentioned [url=http://aa.usno.navy.mil/]US Naval Observatory[/url]), I just use the default (District of Columbia: 77.0°W, 38.9°N) and click once to get my sunrise and sunset. It takes at least 2 minutes between the time the Sun touches the horizon and the time it totally disappears, so why ask for greater accuracy when I don't even know which part of the sunset the quoted time represents.
[quote="neufer (quoting Wiki)"]Many western states have borders that are meridians of "longitude west of Washington", that is, west of the legal 1850 meridian through the Old Naval Observatory [[b]77°3'2.3"W[/b]].[/quote]
My education continues.