Tape calibration is by NIST is 50 newtons, 20å¡C, fully supported. Independent of length. A 300' tape, 50 N. Fully supported; 11 lbs pull.At longer di...

I've found that everything that can be found is at SOPAC. Their data archives are complete to the extreme. So if an ephemeris, or clock file, or earth...

When investigating a time app the key is NTP, network time protocol. Emerald Time is high science, (and a free app).That's millisecond grade. Feed bac...

I think a $40 SW will do exactly the same thing for you as a $140 SW. These days we have timing well below 0.1". When I compare a dozen time syncs, wi...

Lap times, I think. My SW is labeled standard and section. All the watches have both. And I think can switch without data loss. But it's vocabulary th...

A twenty buck watch isn't a commitment til a much better (more $) timing tool is found. HP41 has a great feature, and was a staple for Astro from the ...

The time app he used is by Sequoia: Time Stamp. NTP, feedback loop. One-up-same as GPS, WWV. However, only 0.1" resolution. And at low altitude the su...

Cool dense air has its upside. Astro, even if avocational, has a lot of spin off educational benefits. It's persuit of understanding by doing.

SPC coords inverse 842.741 m grid dist.gulf stream to pom school.

Some how a digital compensated TS doesn't sound better than a manual index, long vial T2.

A Harris:Does the averaging of D/R split, in this test, not confirm reasonable 1" performance H angle? (Which appears to be trunnion axis leveling err...

Downs000-00-17179-59-21 (add 180å¡)___________359-59-49Not expected. But the 179-59-21 is 39", Hax?

See, D/R split.Notice that the 2 horizontal "up" angles average to:Up D 359-59-21Up R 180-00-36 ( subtracting 180-00-00)__________Average H 359-59-58....

I have Trimble hand-held. At turn on the screen shows firmware date 1995. Works fine: position and navigation. And the date is wrong 1024 weeks. But, ...

Now you know why I prefer 100% mechsnical optical analog. And your big D/R split on high vertical angles.

For station Pom School, Eta 2.97", assuming zenith distance to back sight near 90å¡, that calcs to +2.83", additive constant. And in standard trig (+)...

A = ë± ‰öÕ ëá tan ë? ‰öÕ (ë? sin ë± ‰öÕ ëá cos ë±) cot zA= Astro az ë±= Geo az ëá= Xië? = Eta ë?= latitude z= zenith distance to reference piont (back...

ExamplePolaris declination 89.333634å¡Latitude 0.0å¡, East elongation: azimuth of Polaris (zenith 90) is 0.666634å¡, compliment of declination. The ho...

And the Prime Vertical is the 'great circle' passing E/W thru the point, not a circle of latitude. Deflec program does the spherical trig combining Xi...

There you go. Pays to check. And updating Laplace and DUT in the spreadsheet is s common mistake. And it's not a Polaris or vertical angle thing. Any ...