[Carolyn Kennett]

Hello all 

I wanted to report back how close a result we got from our parallax project. 

We had 3 attempts.

The first in February:

We had a good response but mainly from the UK, the furthest image we had to use as a baseline for the Parallax was from Portugal, we saw this as a trial run. The resulting distance we calculated was 271734km and the Moon was 360461km away from Earth, so we were a whopping 24.6% out.

The second in March:

We got lots of images to use for the March attempt, including some lovely ones from the Abu Dhabi Observatory and one form the Philippines which really helped us get a better idea of the parallax shift. This resulted in a calculated distance of 340014km, the Moon at that time was 357122km away so just a 5.03% difference, which I thought was pretty amazing.

The third in April:

The final attempt in April was marred by clouds here in the UK, although I had clear skies in the southwest. We did have a number of US observers taking part including members of Flagstaff and Joe Pasachoff in New York, which made the whole thing seem pretty international. We got a resulting distance of 315736km, the Moon at this date was 356906km away, so we had a difference of 11.5% – pretty respectable.

So overall the second attempt had the closest result. There were lots of lessons learnt along the way, but we were pretty pleased with the results. We really enjoyed this and may run something similar in the Autumn.

We followed Ernie Wrights methodology http://www.etwright.org/astro/moonpar.html

My son who is an A-level student wrote a short computer program which scale plated all the images and came up with averages. A Mayes Creative intern from Exeter University made all the calculations with guidance from myself. 

If you have enjoyed this maybe you would like to check out the following which Jay Pasachoff kindly shared with me

Pasachoff, Jay M., Bernd Gährken, and Glenn Schneider, 2017, “Using the 2016 transit of Mercury to find the distance to the Sun,” The Physics Teacher 55, 3 (March), 137-141: cover illustration plus article: http://doi.org/10.1119/1.4976653

Alan Stern et al., New Horizons team, from beyond Pluto: http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20200417

 

Udo Backhaus, Germany, from the 2019 transit of Mercury:

http://www.transit-of-mercury2019.de/results.php

 

thank you everyone for your interest and taking part.

Best wishes

Carolyn

[Carolyn Kennett]

Thank you all

I think the weather beat us on this one here in the UK. I am very grateful for all your efforts and will report back with the results from the three attempts we have run

best wishes

Carolyn

[Carolyn Kennett]

Wow thank you everyone for posting here and also for emailing me your pictures. They have been wonderful to look through and will all add together to make our attempt to measure the distance to the moon using historic techniques a little more accurate. I was so pleased that so many of us had clear skies and were able to take part.

We are having a third and final run next month, on Tuesday April 28th at 9.30pm, I would love everyone to take part again and I will come on here and remind everyone again the day before. 

Once this third attempt has been run I will then report back on the individual results from each run 

thank you once again and best wishes

Carolyn

[Carolyn Kennett]

Hi James – that’s brilliant any camera image is fine, so mobile or DSLR. thank you Carolyn

[Carolyn Kennett]

Hi David 

thankyou for adding the images.  He really does look like a traditional victorian gentleman in the pictures

Carolyn

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