h is altitude of the sun.

Mica. It is the gold standard

If you want a really good view of all of this, purchase an astronomical almanac for the current year. GPO-USNO-Astronomical Almanac I used to buy one...

My rule is 15 minutes plus 1 minute per km over 15 km (minimum)

I think I know what the mark in the top photo is for...we are monitoring a large dam during the opening of a new coal mine (new coal mine???). The min...

When I was working in El Salvador, we never left any visible sign of the station behind, because that was a sure way to get the point pulled the next ...

I agree that it is pricey. Nothing from ASCE is cheap (have you seen the dues?). But the information is invaluable.

Here is a nice one I saw in the Mexico City Metropolitan Cathedral. They use it to measure the tilt of the building periodically.

A little insight on the 196... 196 mm was the height of the Wild T-2. Then they made Wild glass targets at the same height. Zeiss made the S10 the sam...

If I recall correctly, BOGART system also had negative coordinates (both were South and West). I have documentation somewhere, but not sure where it i...

Scott Zelenak, post: 362979, member: 327 wrote: Long before State Plane coordinates, the USC&G provided three coordinate systems for New York City...

Just to be clear...you cannot go directly from UTC to SPC, you must first go to lat/long. Corpscon disguises this extra step, and is the way I would d...

Try the GWXstopper I mentioned. It works.

I found a small app that blocks that annoying "Upgrade now to Windows 10" (GWXstopper). The family computer that I bought a few years ago with window...

Unless you are talking about rental, there is no such thing as a reasonably priced multibeam system. Of course, it depends on what you mean by reasona...

Well, I wonder why I was so special? I also can no longer run any embedded videos in Chrome. Black screen, says plug in not loaded. I have confirmed t...

Others advise to always have auto updates turned on so that you always have the latest security patch...not sure which is worse.