Search found 1305 matches

by rwilkinson
Mon Jun 10, 2019 11:00 am
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3857

Re: "13 Minutes to the Moon"

Episode 5 is all about the Apollo Guidance Computer - the " fourth astronaut " on each mission. This was the world's first portable digital programmable computer, and the first electronic flight-control system. As well as shrinking a computer from the size of a room down to that of a couple of shoe-...
by rwilkinson
Thu Jun 06, 2019 3:13 pm
Forum: Club events
Topic: 2nd July - an evening of rockets!
Replies: 11
Views: 4887

2nd July - an evening of rockets!

At our July meeting we're planning to celebrate the 50th anniversary of Apollo 11 by launching our own "rockets". But for our version of the Jet Propulsion Laboratory we'll just be fuelling them with water (and compressed air) , rather than high explosives! I've just been testing my own home-made la...
by rwilkinson
Wed Jun 05, 2019 2:53 pm
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3857

Re: "13 Minutes to the Moon"

Episode Four includes the catastrophic fire of Apollo 1, and then the successful test-flight of Apollo 7 just 21 months later:
https://www.bbc.co.uk/programmes/w3csz4dm
by rwilkinson
Mon May 27, 2019 3:23 pm
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3857

Re: "13 Minutes to the Moon"

The third episode is now available: https://www.bbc.co.uk/programmes/w3csz4dl This covers the extraordinary design of the Grumman Lunar Excursion Module ("it looks like an angry creature with four legs, staring at you, daring you to call it ugly!") and its landing procedures. As Neil Armstrong said ...
by rwilkinson
Sat May 25, 2019 6:49 am
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3857

Re: "13 Minutes to the Moon"

The second episode https://www.bbc.co.uk/programmes/w3csz4dk features interviews with some of the young men who operated the Mission Control Center and explains how their response to the Guidance Computer's infamous Program Alarms was only formulated after the final practice simulation, a fortnight ...
by rwilkinson
Mon May 13, 2019 1:09 pm
Forum: Physics, Space Science and Theories
Topic: "13 Minutes to the Moon"
Replies: 11
Views: 3857

"13 Minutes to the Moon"

BBC World Service has compiled a series of podcasts to commemorate the 50th anniversary of Apollo 11.
The first 45-min episode has just been released: https://www.bbc.co.uk/programmes/w13xttx2
by rwilkinson
Thu Apr 18, 2019 12:49 pm
Forum: Astronomical events
Topic: BAA Star Count survey 2019
Replies: 2
Views: 2315

Re: BAA Star Count survey 2019

The results are out: https://www.cpre.org.uk/media-centre/latest-news-releases/item/5102-help-us-enjoy-starry-night-says-cpre-as-cosmic-census-reveals-scale-light-pollution Well over half of all participants (57%) failed to see more than ten stars, meaning that they are severely impacted by light po...
by rwilkinson
Wed Apr 10, 2019 6:52 am
Forum: Club events
Topic: Dark Matter - at Bolton School
Replies: 1
Views: 1589

Dark Matter - at Bolton School

This public lecture later this month should be of interest to our Members:
darkmatter.jpg
darkmatter.jpg (190.79 KiB) Viewed 1589 times
by rwilkinson
Wed Apr 03, 2019 3:56 pm
Forum: Physics, Space Science and Theories
Topic: Historical impact events?
Replies: 0
Views: 1605

Historical impact events?

Following Martin Lunn's talk last night, I found this Review Paper from 2007 which neatly summarises the ideas about "unreported" impact events in recorded history and the observations from tree-rings and ice-cores:
http://tsun.sscc.ru/hiwg/pabl/baillie_2007_jqs.pdf
by rwilkinson
Fri Mar 29, 2019 9:25 am
Forum: Astronomical events
Topic: Flaring up?
Replies: 0
Views: 1572

Flaring up?

Last night, during the course of some tests with an 18mm lens, I captured a transient event near Cassiopeia : flare.jpg This occurred during a 30-sec exposure just before 9pm. I wondered if it was a meteor , but the trail looked too short and symmetrical for that. I made a "heat-map" of its intensit...