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This Full Moon, lets use a easy technique to measure distance to the Moon

February 20, 2024
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This Full Moon, lets use a easy technique to measure distance to the Moon
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I don’t learn about you of us, however the feed within the social media previously generally known as twitter is presently dominated by “cute poop” advertisements (who appear to have displaced the chemtrailers) and flat earthers. 

The previous is a mildly puzzling Japanese phenomenon, whereas the latter seems to be dominated by individuals who haven’t progressed previous a pre-Babylonian view of the world, however who possess P1000 cameras they don’t know tips on how to focus. 

Now as a long-time viewer of the the skies and their wonders, these of us give me the screaming irrits, however I take this as an opportunity for a teachable second, and get individuals concerned in measuring the space to the Moon in a means that anybody can undertake.

One of many tenets of the flat earth motion is that the solar and moon are each small and native (that sound you’re listening to is the ghost of Aristarchus howling on the mentioned Luna). 

 Now, Aristarchus used the time it took for earth’s shadow to cross the Moon in a lunar eclipse and bought a determine that was 1/3 the trendy distance, not unhealthy for unaided eye remark with out fashionable clocks (and hundreds of occasions additional than the flat earth requirement of “native”). 

Now there aren’t any convent whole lunar eclipses this 12 months, so we are able to’t reproduce Aristarchus’s strategies. 

The commonest technique for figuring out the space to the moon, if you’re not bouncing lasers off the mirrors left by the Apollo Astronauts or Soviets, is parallax.

For parallax you and a mate a few hundred kilometers away should take a picture of the Moon on the identical Common Time, near a number of shiny stars, with gear that provides a picture of roughly the identical scale. And also you each want clear skies. Then all you need to do is measure the space between the celebs and the moon, do a little bit of maths and viola, you’ve got the space to the Moon. 

Most likely the subsequent greatest time for parallax is Could 23, when the Moon is near delta Scorpii.

In fact, all this requires a little bit of organisation, as does a lot of the demonstrations of the sphericity of earth. 

Fortuitously, it is a approach to decide the space to the Moon that one can just do by themselves.

All you want is a digital digicam with a good optical zoom perform (or connected to a telescope), an correct timestamp perform, a transparent horizon, and the persistence to take photos for many for the evening, and a picture evaluation program like AstroimageJ to measure the Moons diameter or a Python script.

 

The essential concept is that the moon at moon-rise is additional away than the moon on the zenith by roughly the radius of the earth. (see determine 1, from used beneath that honest use for analysis provisions).

All you need to do is measure the radius of the Moon because it rises and the radius of the Moon when it’s highest, in addition to an correct measurement of the time the pictures have been taken apply a little bit of maths with the radius of the Moon and hey presto, the space to the Moon! (full particulars in “The only technique to measure the geocentric lunar distance: a case of citizen science” at )

(Determine 2, from used beneath that honest use for analysis provisions). 

Properly, after all it’s not that straightforward. Near the horizon atmospheric distortion “squashes” the picture messing with the correct measurement of the radius (this isn’t the horizon phantasm, the place the Moon seems greater, when, actually it isn’t), additionally, it must be a full moon removed from apogee or perigee, when there will likely be sufficient change within the Moons diameter because it reaches the furthest and nearest factors in its orbit to mess up the calculation. 

The Full Moon of February twenty fourth is such a Moon, and that is my problem: to take photos of the Moon between moon rise and the Moon at zenith, then measure their diameter (ensuring the pictures a re time stamped indirectly, normally file creation information within the picture header will suffice, simply be sure to cameras clock is ready appropriately). 

 

(Determine 5. Greatest match of the measured obvious sizes (error-bars) to the theoretical mannequin (steady line. The shaded area
correspond to options statistically appropriate with the noticed obvious sizes at a 5% confidence degree, from .used with permission).

In fact then you need to run the Python scripts given in “The only technique to measure the geocentric lunar distance: a case of citizen science” (at . I did point out you wanted python didn’t I? sadly, the hyperlinks in that paper now not work, however Jorge Zuluaga has kindly handed the scripts on to me so I can ship them on.

 

(Determine 6. Instantaneous distance as a perform of time elapsed for the reason that first remark. from .used with permission). 

You additionally want greater than two Moon pictures for the statistical evaluation (see the figures and the linked paper).

So, what do you suppose? Are you up for the problem?

Labels: astrophotography, citizen science, Moon

# posted by Ian Musgrave @ 10:03 pm



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