Last seen: April 9, 2026 5:20 pm
@bill93 I don’t know which came first: the sub map or the houses. Maybe they built the houses and then put circles around them
Why crowd source the answer? You should test an area, sloping terrain and parking lot.?ÿ
It??s called a glitch.?ÿ
Chicago has a storm drain system 350 ft below grade.?ÿ
I don??t see an issue
A basic total station, and a rodman?ÿ horizontal distance, elevation difference right on screen. Unless the line of sight is overgrown. But farm land ...
@mike-marks You know, your solar az might have been observed better than you think. It sounds more like the data reduction is at fault, than the fiel...
@john-hamilton I level using the vertical circle vial. I bring the halves into coincidence, rotate 180. Then the vertical vial will no longer be in ...
@mike-marks And these days, solar obs may not have a place in the work flow. I refer to my survey of the strobe light as a “civil reenactment&...
@mike-marks not transforming geodetic to astronomic (Xi Eta) can be a big source of grief when the values are large. I learned the hard way. In my are...
Consider an unforeseen event in which gps could be denied or dithered without warning! and solar activity and geomagnetic storms. So always have plan ...
Time UTC UT1 GAST GMST Universal Coordinated Time ?ÿ Universal Time Greenwich Apparent Sidereal Time Greenwich Mean Sidereal Time In several sources o...
@mike-marks The survey that I presented is intended to: a) determine the coord of the strobe light, b) evaluate the azimuths. Re: your question ...
@mike-marks Do you use geodetic grade tripods? They're heavy. If not, do you avoid unstable setup situations? Good wood. Regular tripod...
@john-nolton Looking forward to your your comment
@mike-marks Mike ... An extraordinary claim needs evidence. I made a claim of higher accuracy solar azimuths than is expected. Attached is Starnet o...
@mike-marks To be sure repeatability 1-2 seconds cannot be counted on. I’ve worked hard on refinements of the observation procedure over the pa...
@mike-marks A few years ago, I observed a radio tower strobe light 5-12 mi distant, from 9 widely separated points. Using opus derived coordinates an...