I measured my latitude by observing Polaris at lower culmination this evening (at about 19:50 PDT).
Face Left=307-56-05 at 02:49:50 UTC
Face Right=52-04-05 at 02:51:22 UTC
Mean=52-04-00 (Zenith)
Apparent altitude=37-56-00
Cr (refraction)=1' 8.2" at 91F, Barometer=29.81
Corrected altitude=37-54-51.8
Declination of Polaris=89-18-46.5
Therefore observed Latitude=38-36-05.3N.
I have been using 38-36-02N for my front yard from old GPS observations. This was done in my backyard, however. 38-36-05.3N lands in the street about 150' north of me per Google maps.
Tomorrow I hope to observe the transit of the Sun to get my longitude.
Hey, if you ain't figgered out yet whar you is, don't go 'spectin' any of us tuh tell ya.
[flash width=420 height=315] http://www.youtube.com/v/nsdZKCh6RsU?version=3&hl=en_US [/flash]
Maybe the proverbial .04 ....
we talk about is not .04 feet, but rather .04 minutes.
Yes, But You Have To Show Deviation From The Vertical
You have made a reasonable observation on the Geoid, however Latitude is referenced to the Ellipsoid.
Paul in PA
Yes, But You Have To Show Deviation From The Vertical
http://alt.ngs.noaa.gov/cgi-bin/GEOID_STUFF/deflec09_prompt.prl
As Bill's Link Says, We Need An Observation Of Longitude
OK, I'll wait.
Hope it is a sunny day, so I don't have to wait too long.
Paul in PA
As Bill's Link Says, We Need An Observation Of Longitude
Paul-
Xi is -1.62" so my "answer" is south of the geodetic latitude if I understand NGS's read me correctly.
-Dave
PS:
USER LOCATION 38 36 02.00000 121 21 27.00000 Xi= -1.62 Eta= -7.05 Horr LaPlace= 5.63
Could you pick the position off google maps and end up with a more accurate lat/long?
It appears that you can but that isn't as much fun, educational and challenging.
Perhaps you mistakenly focused on Kawasaki, the evil twin of Polaris.
I think Polaris has two star companions.
"? UMi A is a six solar mass[2] F8 supergiant (Ib) or bright giant (II). The two smaller companions are: ? UMi B, a 1.5 solar mass[2] F3 main sequence star orbiting at a distance of 2400 AU, and ? UMi Ab (or P), a very close dwarf with an 18.8 AU radius orbit. There are also two distant components ? UMi C and ? UMi D.[2]" -from Wikipedia
That Pretty Much Accounts For Most Of The 150' Off
What is your geoid elevation?
Paul in PA
That Pretty Much Accounts For Most Of The 150' Off
My orthometric height is roughly 90 feet (NAVD88).
Geoid separation in California is generally on the order of 30 meters.