Tuesday 30 July 2019

Moon Tuesday 16th July 2019

Here's a photo of the Lunar eclipse 4 days before the Apollo 11 moon landing anniversary.

But a question:
Why are there no photos of the Apollo 11 capsule re-entering Earth to splashdown?

The USA had high-altitude, high-mach number planes, such as the Lockheed SR-71 Blackbird (2,380 mph / Mach 3.32 & 85,000 ft / 16.1 miles) and the North American Aviation X-15 (4,520 mph / Mach 5.89 & 354,330 ft / 67.1 miles). Also the Apollo 11 flight journal says that a Boeing C-135 Stratolifter "will attempt to photograph this re-entry of the Command Module ... on 70mm still film." The C-135 was capable of 580 mph / Mach 0.76 & 50,000 ft / 9.5 miles.

But you have to think about how fast the Apollo 11 capsule was during reentry.

At Earth Entry (400,000 ft / 75 miles) it was travelling at c.81,000 mph / mach 105.5!

Complicated science involving the blunt high-drag design of the capsule and the atmosphere loosing the capsules kinetic energy through gas friction slowed that down to c.300mph / mach 0.4 at 23,300 ft / 4.4 miles when the drogue parachutes could be deployed. It did this in about 9 minutes!

But they did manage to take such a photo, of the Apollo 8 reentry!
https://spaceflight.nasa.gov/gallery/images/apollo/apollo8/html/s69-15592.html

Check out these references:
https://history.nasa.gov/SP-4029/Apollo_18-40_Entry_Splashdown_and_Recovery.htm
https://history.nasa.gov/afj/ap11fj/26day9-reentry.html
https://www.bbc.co.uk/bitesize/clips/zphpg82
https://en.wikipedia.org/wiki/Atmospheric_entry

Time 22:55.
Distance 246,189 miles.
Full moon phase.
150 degrees SE compass point (azimuth).
Altitude 8.8 degrees.


Saturday 20 July 2019

Moon Thursday 18th July 2019

Apollo 11, 20th July 1969, Man on the Moon.

We made our first powered flight and put a man on the moon in the space of a human lifetime!
On December 17, 1903,  the Wright brothers made the first airplane flight.

(e.g. someone aged 10 in 1903 watching the first aeroplane flight could also have watched Apollo 11 on the Moon when they were 76 years old.)

Time 23:45.
Distance 249,666 miles.
Waning gibbous phase.
135 degrees SE compass point (azimuth).
Altitude 8.3 degrees.


Thursday 18 July 2019

Moon Thursday 18th July 2019

Apollo 11, 18th July 1969, CDR and LMP entered LM for initial inspection.



Tuesday 16 July 2019

Moon Tuesday 16th July 2019

Apollo 11, 16th July 1969, Liftoff.



Moon Monday 15th July 2019

15th July 1969, Scheduled 11-hour hold at T-9 hours.

Time 22:30.
Distance 245,176 miles.
Waxing gibbous phase.
155 degrees S compass point (azimuth).
Altitude 10.2 degrees.


Monday 15 July 2019

Moon Sunday 14th July 2019

 Apollo 11 Timeline, 14th July 1969, 21:00:00, Terminal Countdown started.

(1st / 2nd photos)
Time 20:45 / 23:25.
Distance 244,131 / 244,131 miles.
Waxing gibbous / waxing gibbous phase.
140 / 175 degrees SE / S compass point (azimuth).
Altitude 6.7 / 14.7 degrees.



Sunday 14 July 2019

Moon Saturday 13th July 2019 - Jupiter

Jupiter is the fourth-brightest light in the sky, after the Sun, Moon and Venus.
It is also more than 1,700 times the Moon’s distance from Earth!

Time 21:30.
Distance 241,921 miles.
Waxing gibbous phase.
160 degrees S compass point (azimuth).
Altitude 15.0 degrees.


Moon Saturday 13th July 2019



Tomorrow 50 years ago, the Apollo 11 Terminal Countdown started, and this time next week 50 years ago, Apollo 11 landed on the Moon!

And today 50 years ago, Soviet Russia launched the unmanned Luna 15 to the Moon. They had to tell the USA the flight path so that it would not crash into Apollo 11. Unfortunately it crashed into the Moon instead.

In Britain you could have listened to the no.1 record on the radio, Thunderclap Newman's 'Something in the‏ Air'.
https://www.youtube.com/watch?v=k8zmkzshUvE

Or on BBC 1 you could have watched the Film Matinee starring Bing Crosby singing 'Don't let that moon get away'.
https://www.youtube.com/watch?v=MsSewdsqTqM

Time 21:30.
Distance 241,921 miles.
Waxing gibbous phase.
160 degrees S compass point (azimuth).
Altitude 15.0 degrees.