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omarreis

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  • CamSextant Iphone Sextant

    You can install the app for iOS and Android. Its free.Search for "CamSextant" on your store

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  • omarreis commented on omarreis's instructable The Foamboard Octant
    The Foamboard Octant

    You are correct. I tried to warn the user about the risks of Sun observation. The filter I used is safe enough, but I cannot say that about other welder filters around. Science supply stores sell filters specific for Sun observation using telescopes or binoculars. These are a bit expensive, but probably the safest materials.

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  • omarreis commented on omarreis's instructable Iphone Sextant Project
    Iphone Sextant Project

    incorpora solamente refracción y paralaje.Semidiametro no ( use al centro del objecto )Elevacion del observador no se aplica ( el sensor del telefono es como un sextante de burbuja )

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  • omarreis commented on omarreis's instructable The Foamboard Octant
    The Foamboard Octant

    From what I seen on the Internet, and my personal experience, welder glass #14 is safe for Sun observation. See https://www.rasc.ca/tov/safety for more details. Of course you don't want to observe the Sun for too long, not more than necessary to get the altitude.

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  • omarreis commented on omarreis's instructable Iphone Sextant Project
    Iphone Sextant Project

    elevación del observador - No aplicable: el giroscopio es como un sextante de burbujassemidiametro - No. Usa el centro del astrorefracción y paralaje - Si. Estos se aplican

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  • omarreis commented on omarreis's instructable Iphone Sextant Project
    Iphone Sextant Project

    Hs = Sextant altitude ( a.k.a. instrumental altitude ) - On CamSextant this is Hs = gyro Elevation - Calibration Altitude corrections (automatically applied) = Parallax in altitude+atmospheric Refraction Hcorr = Corrected Altitude = Hs - Altitude correctionsNotes:* Semi-diameter is not considered, so aim for the center of Sun and Moon. * Height of the eye is not considered either since the phone gyro does not use the sea horizon altitude. Its more like a bubble sextant (not entirely true if using Calibration :( )* Index error is corrected by Calibration procedureHc = Calculated altitude ( object center calculated altitude, on the Assumed Position, using phone time and internal nautical almanac )It is important to keep the phone time and timezone correctly set ( Settings )Delta = Hcor…

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    Hs = Sextant altitude ( a.k.a. instrumental altitude ) - On CamSextant this is Hs = gyro Elevation - Calibration Altitude corrections (automatically applied) = Parallax in altitude+atmospheric Refraction Hcorr = Corrected Altitude = Hs - Altitude correctionsNotes:* Semi-diameter is not considered, so aim for the center of Sun and Moon. * Height of the eye is not considered either since the phone gyro does not use the sea horizon altitude. Its more like a bubble sextant (not entirely true if using Calibration :( )* Index error is corrected by Calibration procedureHc = Calculated altitude ( object center calculated altitude, on the Assumed Position, using phone time and internal nautical almanac )It is important to keep the phone time and timezone correctly set ( Settings )Delta = Hcorr - Hc

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  • omarreis commented on omarreis's instructable The Foamboard Octant

    Thanks you for the message. There is concern over the use of welder mask glass as a filter for Sun observation. Most of it is directed to the attaching those filters to eyepieces or binoculars, that concentrate de light even further. With those optical devices, even a temporary mechanical failure of the filter may cause instant harm to the eye.Not the case with this project, which uses no eyepiece. But of course the concern is valid and the danger is real. This Nasa site suggests that you should use at least welder shade #12 ( #14 is even better ). The text focuses on eclipse observations, which are particularly dangerous because people stare at the Sun for a long period in those events. Read it:https://eclipse2017.nasa.gov/safety There is also this discussion about this subject ht…

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    Thanks you for the message. There is concern over the use of welder mask glass as a filter for Sun observation. Most of it is directed to the attaching those filters to eyepieces or binoculars, that concentrate de light even further. With those optical devices, even a temporary mechanical failure of the filter may cause instant harm to the eye.Not the case with this project, which uses no eyepiece. But of course the concern is valid and the danger is real. This Nasa site suggests that you should use at least welder shade #12 ( #14 is even better ). The text focuses on eclipse observations, which are particularly dangerous because people stare at the Sun for a long period in those events. Read it:https://eclipse2017.nasa.gov/safety There is also this discussion about this subject https://physics.stackexchange.com/questions/26203/...Alternatively, there are aluminized filters like this:https://www.amazon.com/Solar-Filter-Telescopes-Bin... Other Sun safety tips:* Install the Sun shade before the observation starts* Previously set the expected instrument altitude before the observation, so you don't waste so much time looking for the Sun. * Perform the observation as fast as you can. With preparation, it should take only a few seconds to adjust the octant arm * If it takes too long or if you feel uncomfortable, stop the observation and rest

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  • omarreis commented on omarreis's instructable The Foamboard Octant

    Done that.. Thanks

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  • omarreis's instructable CamSextant iphone sextant's weekly stats:
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  • In the movie "5th element" there is a thing like that(a spy roach)

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