# FeaturedStargazing U.S. Solar Eclipse of Aug. 21, 2017

1. Jun 10, 2017

### SetepenSeth

The good news for me is that I´ll be out on vacations from college on this date, the bad news, I don´t think I can afford a trip to the US, being a broken college student in Mexico City does not allow much of my budget for traveling (shame, shame). Still here will be visible as a partial eclipse, so I got that going for me, which is fine.

2. Jun 10, 2017

### OmCheeto

I'm 58 years old, and this will be the first one I've had an opportunity to see.
I just checked my military records, and discovered I was in Florida the last time an eclipse was in the area.
It's kind of funny, as just two months later I was transferred to Idaho, very near the path.
But not too funny.

3. Jun 11, 2017

### Stavros Kiri

Assuming the moon is moving outwards (away from earth) at a [current] rate of about 4cm a year (1m in 25ys; 100,000km in 2.5 bill. ys), can someone give a rough estimate of when will be the last total eclipse?

4. Jun 11, 2017

### Staff: Mentor

5. Jun 11, 2017

### Janus

Staff Emeritus
I get roughly 787 million years. This is assuming the last possible total eclipse will occur when the Earth is at aphelion while the Moon is at perigee. This does not however take into account any change in the Earth/Sun distance during that time period.

6. Jun 11, 2017

### Stavros Kiri

Sounds reasonable, and thanks for the source (I saw the earth-solar system etc. timeline table ... - other useful deadlines/timelines on your source too).
But I mostly meant with a rough calculation, assuming noticable changes on the moon phenomenal diameter, assuming at first stage that the earth is not moving away from the Sun ... (but it does! ...).
Sounds reasonable too, and it's about of the same order of magnitude as mfb's.
I agree.

7. Jun 11, 2017

### Janus

Staff Emeritus
It also doesn't take into account other factors, such as continental drift, which by changing the arrangement of the continents, alters the value of the tidal drag and thus the recession rate of the Moon.

8. Jun 11, 2017

### Staff: Mentor

Wow, I think that's pretty amazing that the models are so refined as to make effects that small significant. How big is that effect. $10^{-1}$? $10^{-3}$? $10^{-5}$?

9. Jun 11, 2017

### Staff: Mentor

It should be quite significant, as water tides are an important part of the process. Unfortunately it is hard to model that.

The size of Sun increases over time, this is relevant as well.

10. Jun 11, 2017

### Stavros Kiri

Furthermore, both moon's recession rate as well as earth's rotation seem to be slowing down over time (with a connection between the two effects).
E.g. see:
http://rationalwiki.org/wiki/Recession_of_the_Moon

Note: precise current moon retreat rate: (3.82±0.07) cm/yr

Last edited: Jun 11, 2017
11. Jun 13, 2017

### Stavros Kiri

Let's enjoy the total solar eclipses for the next ~600 million years, starting with the one coming up ...
Yeah, we got time!

12. Jun 13, 2017

### MalcolmB

I travelled to Penzance in the UK for the August 11 1999 eclipse and it rained!

I had better luck for the March 29 2006 one in Side,Turkey. We were right on the eclipse track and the BBC team were in the next hotel. Unfortunately dear old Patrick Moore was too ill to attend. I got some great video and stills of the event. I still had time to see it in all its glory despite fiddling with cameras!

Truly awesome is the only way to describe a total solar eclipse.

13. Jun 17, 2017

### Battlemage!

This one will pass right over me. I'll be out there watching, probably in Gallatin Tennessee, or wherever in the state the best weather is.

14. Jun 19, 2017

### Borg

15. Jun 21, 2017

### Borg

NASA's Great American Total Solar Eclipse Preview @ 1 pm ET Today

16. Jun 21, 2017

### Stavros Kiri

1. Science Briefing about the eclipse by NASA (a bit lengthy, but good video):

2. Interesting and short ... :

17. Jun 23, 2017

### Stavros Kiri

New & interesting (excellent videos from NASA):
1. Eclipse Primer on "This Week @NASA" (Today, Fri June 23, 2017):

2. Ways to watch the Eclipse (came out on 6/21/17):

3. Safety Briefing (6/21/17):

18. Jun 23, 2017

### stoomart

This makes me glad to be living in Salem, I just hope the weather doesn't do anything crazy. :)

Last edited: Jun 23, 2017
19. Jun 27, 2017

### Borg

Last edited: Jun 27, 2017
20. Jun 27, 2017

### Stavros Kiri

I still have my packet of "Science&Telescope" eclipse glasses from the Aug. 11, 1999 eclipse in Europe. Who thinks they are still safe to use them?

Here's also a couple of short videos from back then: