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    Re: Space station sextant experiment
    From: Robert Pearson
    Date: 2018 Sep 5, 10:53 -0700

    Interesting picture Dave, Thanks.

    Using a Celestaire Astra III Professional sextant with a NASA emblem affixed. I believe it's currently manufactured by Changzhou Celestaire Instrument Co Ltd. An excellant Chinese made instrument. It's more than sufficient for marine navigation on earth. The stated accuracy is +/- 15 arcsec. 

    I have a GLH130-40 manufactured in 1988 by the China Changzhou Shipping Equipment Plant in my collection. The stated accuracy is 40 arc seconds peak to peak value. I'd interpret that to be +/- 20 arcsec. It's equivallent to Celestaire's Astra IIIB. Of course the certificate says free from errors for practical use across the full arc. It's was used by a Canadian yatchman just a few times and is in excellant condition. One of these evenings I'll be making a rough check on it's accuracy taking some star to star distances. Something like the ISS astronauts in the ongoing experiment. See below for some addition info on the experiments.


    Robert Pearson

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