|
ColoHank
sage
Reged: 06/07/07
Posts: 204
Loc: western Colorado
|
|
Back in my college years, I worked summers as a surveyor for a crusty old civil engineer in rural northern Kentucky. That part of Kentucky had been settled for a very long time, and it had been parceled out and surveyed by metes and bounds long before anyone had conceived of or employed the township and range method used when the country west of the 100th meridian later opened to settlement. For many of our surveys, we used a fine old brass compass rather than a transit, because a transit would have been too accurate and our results never would have matched the original metes and bounds. Often, old survey boundaries were defined by quaint and not very precise wordings like "Beginning at a chestnut tree by a fence," or "...thence 250 feet along the south bank of Sloan Creek," or "finally North 25 degrees East for 43 rods to a corner marked by a large rock..." The old engineer loved those metes and bounds. When we'd express concerns about finding such an old corner, he'd just laugh and say, "Hell, you can always find a large rock in Kentucky."
So it was last night. I set up the Questar in the driveway (not where I customarliy observe) for a couple of hours to try out my new 16mm and 32mm Brandons. After polar aligning, I swung over to Sirius to calibrate my RA circle and then checked out Saturn and a few Messier objects. The problem was, my celestial coordinates were off a considerable bit. The scope kept drifting off target, and I had to make frequent corrections to keep objects centered in the field of view. I thought perhaps the RA circle had been nudged and slipped, so I sought Sirius again to recalibrate, but Sirius had already set behind my roofline. I re-calibrated on Betelgeuse instead and then went back to my list of Messiers. Still off. After a few minutes of that little back-and-forth dance, I decided to check my polar alignment and discovered that, in the pre-darkness, I had originally aligned on some nameless (to me) star about five degrees from Polaris. I recall that Ursa Major wasn't visible yet, and that I had sort-of guessed where true north and Polaris lay.
To paraphrase the old engineer, "Hell, you can always find a star in the heavens."
Heinrich Heine (1797-1856) once offered this description of a political appointee whom he held in low esteem: "Ordinarily he is insane, but he has lucid moments when he is only stupid." Last night, Heine could have been talking about me.
Anyway, both new eyepieces performed admirably and the view of the Beehive was particularly lovely viewed through the 32mm.
-------------------- ---------------------
Questar 3.5 standard - pyrex and BB coatings
Powerguide II
12mm, 16mm, 24mm and 32mm Brandons
modified Bogen 3030 w/ homebuilt wedge
other odds and ends...
---------------------
"Nothing exists but atoms and empty space. Everything else is opinion."
Titus Lucretius Carus 99-55 B.C.
|
rocco13
Carpal Tunnel
Reged: 07/29/06
Posts: 1544
Loc: Phoenix, Arizona
|
|
Interesting about the survey background.
I spent about 12 yrs in the surveying field and occasionally had to use notes from original surveys from way back when. Back in the early 90's, I was re-tracing an old survey in southern Arizona where the most recent notation was from between 1895-1907, before Arizona became a state. Many of the landmarks such as trees, etc, had long since turned to dust in those ±90 years, but it was still fun trying to verify points.
What was the most interesting aspect of those old time surveyors out here in the old west was some of the notes they kept. I recall seeing several entries such as "injuns sighted in the vicinity, had to stop", "unidentified campfire smoke up ahead", and those areas which were deemed 'unsurveyable', due to the primitive equipment back then.
-------------------- Rocco
Super C8 (1984 vintage)
Celestron 102 f/5
and a cheap pair of binoculars
|
peashooter
member
Reged: 07/07/07
Posts: 73
Loc: Central USA
|
|
We've all done that, for certain! In wintertime, when it gets dark early it's natural to sight on Polaris and confirm it by identifying its faint companion. But now we've got late twilight & want to start observing before it gets really dark. My solution is one of those cheap $3 compass/whistle combinations on a lanyard. With it, I point the scope north and attach the tripod legs. Since the polar leg length hasn't been changed since the last observing session, you should be good to go until it gets dark enough to zero in on Polaris. A few weeks ago through pure "dumb luck" I was able to set it up close enough to the pole using this down-and-dirty method that to my surprise I found it was tracking perfectly and the setting circles could be used with no further adjustments. 
P.S. ColoHank, do you use a photo-tripod or the scope's own built in tripod legs on some sort of a table-top?
-------------------- Questar 3-1/2"
Zeiss 8X56
|
ColoHank
sage
Reged: 06/07/07
Posts: 204
Loc: western Colorado
|
|
My Questar is mounted on a shop-built adjustable wedge on a modified Bogen 3030 tripod. The wedge is usually set for my home latitude of 39 degrees, 7 minutes, or at least as close as I can get to that value. The tripod rests on a platform with leveling screws which allow me to more precisely dial in final alignment. The set-up offers just about everything I need except a brain. For whatever reason, I've never used the little tripod legs that came with the scope.
-------------------- ---------------------
Questar 3.5 standard - pyrex and BB coatings
Powerguide II
12mm, 16mm, 24mm and 32mm Brandons
modified Bogen 3030 w/ homebuilt wedge
other odds and ends...
---------------------
"Nothing exists but atoms and empty space. Everything else is opinion."
Titus Lucretius Carus 99-55 B.C.
|
peashooter
member
Reged: 07/07/07
Posts: 73
Loc: Central USA
|
|
Very good-looking mount & bet it's steady too!
-------------------- Questar 3-1/2"
Zeiss 8X56
|
NeilR
member
Reged: 02/18/08
Posts: 63
|
|
Hank, great surveying stories! I'm not a surveyor; I thought it was done more scientifically
You did that polar alignment on Kochab, one of the two stars in the end of the bowl of Ursa Minor.
I did the same exact thing a couple of weeks ago, setting up early at a friend's house. Not being familiar with his turf, I was unsure of true North.
The problem is that this time of year Kochab is at the exact same altitude as Polaris at about 7:15pm (my local civil time) and just slowly rises during dusk. Although my software lists Polaris as Mag 2.0 and Kochab as Mag 2.05, I am sure only Kochab was (at least obviously) visible at the time I set up. Kochab is actually 16 degrees from Polaris, quite a distance.
Not being a professional surveyor, I resort to my own quaint practices. From my favorite viewing position on my patio, Polaris is surveyed as "just between those two big branches on that oak tree that I wish had died, instead of the one next to it".
In about 3 weeks Polaris will be officially "unsurveyable" due to the leaves on that tree.
We had a recent discussion here about using Kochab to align the offset of Polaris from true North, per Ron's "painless" technique. Since I rarely see Kochab from my usual observing position (blocked by the trees), I never thought about who shows up first at dusk.
Edit: Come to think of it, Polaris is a Cepheid variable, varying between Mag 1.86 to 2.13 according to SkyMap. That complicates things.
Edited by NeilR (05/03/08 10:29 PM)
|
ColoHank
sage
Reged: 06/07/07
Posts: 204
Loc: western Colorado
|
|
Thanks for a very plausible explanation. It's good to know that I'm not the only one who occasionally gets lost in the heavens.
Hank
-------------------- ---------------------
Questar 3.5 standard - pyrex and BB coatings
Powerguide II
12mm, 16mm, 24mm and 32mm Brandons
modified Bogen 3030 w/ homebuilt wedge
other odds and ends...
---------------------
"Nothing exists but atoms and empty space. Everything else is opinion."
Titus Lucretius Carus 99-55 B.C.
|
Clive Gibbons
Mostly Harmless
   
Reged: 05/26/05
Posts: 10237
Loc: Oort Cloud
|
|
Beautiful setup ya got there, Sir!
--------------------
A few telescopes of dubious value.
Understanding wife and three curious cats.
"Semper ubi sub ubi"
|
woodsman
sage
   
Reged: 03/12/08
Posts: 483
Loc: Colorado Springs, CO
|
|
Hi: I am going to steal your picture of the mount, if you don't mind and build a wedge and tripod for my C-90. It is excellent work. I really love the ingenuity. Just Great!! Rich
-------------------- artisticwoods
C-14 Orange Tube
C-8 Orange
C-5 Orange
C-90 Astro Model
Sears 90mm f/15.56 Refractor
Sears 80mm f/15 Refractor (2)
Tasco 60mm f/15.2 7TE
Scope 60mm f/11.7
Sears 50mm f/12
B&L 60mm Spotter
|
ColoHank
sage
Reged: 06/07/07
Posts: 204
Loc: western Colorado
|
|
Rich:
Thanks for the compliment! I'm delighted that my set-up has helped inspire you, and I wish you every success in building a wedge and tripod that meet your particular needs. If you need any additional info, feel free to PM me. One of these days, I'd like to build something to replace my tripod and platform -- perhaps a portable pier which employs torsion box legs with built-in leveling screws. It's not that my current outfit doesn't work well. It really does. Sometimes I just get an itch to make stuff.
-------------------- ---------------------
Questar 3.5 standard - pyrex and BB coatings
Powerguide II
12mm, 16mm, 24mm and 32mm Brandons
modified Bogen 3030 w/ homebuilt wedge
other odds and ends...
---------------------
"Nothing exists but atoms and empty space. Everything else is opinion."
Titus Lucretius Carus 99-55 B.C.
|
Joe Bergeron
Vendor - Space Art
Reged: 11/10/03
Posts: 843
Loc: Upstate NY
|
|
You may be interested to know that Don Yeier of Vernonscope also started out as a surveyor.
-------------------- Seven telescopes of a diverse nature.
Multiple chums glittering in the sky. New friends await.
My Web Site
English Lessons for Amateur Astronomers
|
teast
sage
Reged: 11/10/07
Posts: 268
Loc: Kentucky
|
|
Hi ColoHank, PM sent.
-Tom
|
|
0 registered and 2 anonymous users are browsing this forum.
Moderator: spaceydee, Clive Gibbons
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 1295
|
|
|
|
|
|
|