ResearchFlatMoon | The Sextant | Noon Sight @ResearchFlatMoon | Uploaded September 2021 | Updated October 2024, 1 hour ago.
Time for some practical navigation. Today we take a noon sight with the A-12 Bubble Sextant and the Davis Mark 25- and nary a horizon in sight....

Note, this was in my driveway, so I degrade the reading by not taking all corrections into account and taking multiple readings. A talented amatuer for sure, but I am an amatuer with the sextant and my accuracy is expected to be within 15 nautical miles of my location. I do quite a bit better than that on this reading just after (hint) solar noon.

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$Decoding the Curve Calculator In this episode we look at the curve calculator, fully explaining both the straight calculator and how it is adjusted for refraction. Right Triangles and the Pythagorean Theorem are covered, along with a discussion of refraction. Remember to hit Like and Subscribe, your support of this channel is appreciated.$

$The Ring of Fire Eclipse | June 2021 Dawn on June 10th brought a partial annular solar eclipse to Mid Michigan and I was there with the 80mm refractor to capture it live. Using that raw footage, I created this video of the eclipse. An annular solar eclipse means the angular size of the moon is smaller than that of the sun (moon at apogee and earth at perigee is a usual cause). This results in the moon incompletely covering the sun even when center on center, resulting in a rim of sun all the way around the moon (the ring of fire). This is a partial eclipse of the annular kind. Take a moment, relax to the music and gaze in wonder of the majesty of the universe. I couldnt make these videos without the support of my viewers, so please take a moment to like and subscribe to my channel. Bob the Science Guy aka ResearchFlatMoon$

Denying the Shape of the Earth | Sea Sparrow Missile

$Radius of the Earth | The Method Al BOB Runi.... We have a number of ways to determine the radius of the earth. Today Bob introduces a new one to the debunking community. This is perfect to use with low camera angle We see too far videos. No equipment is needed, you just have to identify how much of an object at a known distance is hidden. Very simple formula (d^2 - h^2)/2h... One note for the purists... What we see on earth is affected by refraction, so this technique actually has a second function. Measuring the horizon and determining the hidden amounts of buildings, oil rigs and mountains from a low angle will give a refracted radius according to this approach, comparing the refracted radius to the known radius of the earth is a good way to estimate the amount of refraction in an observation. Last night I did a little math on the board. Looking at Walter Bislins Earth Curvature Calculator, taking an observer height of 0 and a distance of 9.41 miles I saw the non-refracte hidden ws 58 feet and the refracted hidden was 48 feet (standard refraction). I applied my formula to both. The non-refracted result was within 1% of the actual radius of the earth. The refracted result was about 1.22 x the actual radius. Correcting the standard 7/6R Refraction (ie multiplying the results by 6/7) gave me a result within 5% of the actual. Not bad. One source of error is the way distance is measured. With Al- Biruni and Al Bob Runi, we look at distance to the object as the straight leg of a triangle. In reality that is an approximation as the distance between the observer and the target is along the curved surface of the earth, which is slightly less than the distance of the straight leg of the triangle. Correcting the distance for the non-refracted value (58 feet) our error in radius goes from 71km to 60km (out of a true radius of more than 6300 km). Use the method for what it is designed-. to make a good estimate of the apparent radius of the earth based on 1/ a low observation point 2/ an estimate of the hidden height of a distant object (this can have various degrees of accuracy) and produces a result that gives an approximation of the REFRACTED value for the radius rather than the geometric radius. One would expect refraction would be a little higher than normal for a very low observer point compared to a mountain. Multiplying it by 6/7 gets you close to the true R in cases of standard refraction, and the original calculated value compared to the true radius lets you estimate the amount of refraction without the need to measure all the temp and humidity data between you and the target (a common demand by science deniers). You can measure the refraction directly and compare it to data from different days. Bob Ps Thanks to BlueMarbleScience for reviewing the video and suggesting the name Thanks to Judy for reviewing the math and technical aspects of the video.$

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The Sextant | Noon Sight @ResearchFlatMoon