Recent Posts

1

General Discussion / Re: Kids say the darnedest things...

« Last post by Peter B on Today at 01:44:17 AM »

School holidays...

13YOS: There's only two things I want to do at the moment.

11YOD: Stay in bed and watch TV?

...pause...

13YOS: There's only four things I want to do at the moment.

2

General Discussion / Re: Eclipse 2024

« Last post by Zakalwe on April 15, 2024, 04:25:54 AM »

The moon phase at a total solar eclipse?

 

3

General Discussion / Re: Eclipse 2024

« Last post by jfb on April 12, 2024, 06:59:23 PM »

We didn't see any stars at totality.  Venus and Jupiter were visible, but that's it. 

4

General Discussion / Re: Apollo 11 video feed delay?

« Last post by jfb on April 12, 2024, 06:55:54 PM »

Here's a pretty authoritative document describing the conversion process. 

Short version: the signal from the Moon was displayed to a slow-scan, high-persistence-phosphor monitor.  A second TV camera photographed the image on the screen, that signal was doubled with a delay to emulate a 525-line NTSC frame, repeat 3 times per frame. 

I have no clue were he gets the "3 hours" from. 

5

General Discussion / Re: Eclipse 2024

« Last post by Allan F on April 12, 2024, 06:16:14 PM »

The moon phase at a total solar eclipse?

6

General Discussion / Re: Eclipse 2024

« Last post by PDI on April 12, 2024, 01:04:18 PM »

There's a video on YT mapping total eclipses for the next 20 years around the world. South-east Australia (where I am) gets a pair in 2028 and 2030.

Perhaps I can see about putting out the welcome mat...

The welcome mat would be great! My wife and I can meet you where ever. (Compared to our trip from the United States to Australia, a few hundred kilometers one way or another won't make a difference.)

Do you know what the Moon phase will be? I would like to see the stars in the southern hemisphere, too!

7

General Discussion / Re: Eclipse 2024

« Last post by Peter B on April 11, 2024, 11:08:59 PM »

There's a video on YT mapping total eclipses for the next 20 years around the world. South-east Australia (where I am) gets a pair in 2028 and 2030.

Perhaps I can see about putting out the welcome mat...

8

General Discussion / Re: Eclipse 2024

« Last post by raven on April 11, 2024, 06:01:44 PM »

Was close to the edge of any kind of shadow at all, being in the Pacific North West, and even if it wasn't, it was completely overcast, so no dice here, I'm afraid.

9

General Discussion / Re: Eclipse 2024

« Last post by jfb on April 11, 2024, 12:34:46 PM »

We drove in to Liberty Hill just north of Austin; while our house was technically in the zone of totality, we'd only get like 11 seconds or so.  Clouds were problematic right up until totality, and then the sky cleared like magic.  Got some extremely bad cell phone pics, but no pictures can do it justice anyway. 

10

The Hoax Theory / Re: Saturn V Third Stage - Not enough room

« Last post by jfb on April 11, 2024, 11:29:34 AM »

Is there a website which literally adds up the bits within the Third stage that shows it does all fit

You could go to the source: Apollo Saturn V Flight Manual.

Although this site works as well, with some other historical context.  All of the following diagrams are taken from there. 



The Saturn V rocket is everything from the Instrument Unit on down.  The LM is not part of that volume. 

These are the rocket stages, with dimensions:

S-IC (first stage):


S-II (second stage):


S-IVB (third stage):


S-IVB tank construction:


As is clear from the diagrams, engines and pumps took up space in the interstages; some lines were routed through the tanks, some around the tanks, etc.  Other diagrams at the site show how tanks were constructed, how engines were mounted to thrust structures, how fuel flow worked, etc. 

It's not light reading (unless you're a freak), but it shows that yes, Virginia, you could fit everything you needed within the Saturn V's volume (remembering that the spacecraft are not part of that volume).