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Posts Made By: Alex McConahay

January 24, 2005 08:43 PM Forum: Beginning Astronomy?

Understanding viewing conditions

Posted By Alex McConahay

Seeing is how steady the night air is (and thus how steady the stars are). Transparency is how clear it is (and thus how many of them you can see).

Things can be very steady but not transparent. This happens, for instance when there is moisture in the air.

Things can be very transparent, but not steady. This happens, for instance after a storm has gone through and the air is so clear you can count the stars in the Little Dipper. Unfortunately, it is so unstable that they are twinkling like Christmas lights.

As for books, I don't know. (I'll work harder on this if the rest of the forum does not respond.)

As for not having to ask questions if you get the right books. Don't ever stop asking questions. It is fun to answer them.

Alex

January 25, 2005 09:03 PM Forum: Equipment Talk

need advise constructing observatory

Posted By Alex McConahay

Go over here:

http://www.astropier.com/installation.html

for a good description.

You will need lots of concrete very deep if you want long term stability.

You will need to make two pours. ONe for the pier, and then you wrap the pier base in something so that it is separate from the floor. Then pour the floor. If you try it in one pour, footsteps will transmit to the pier.

Good Luck,

Alex

January 31, 2005 03:15 AM Forum: Beginning Astronomy?

taking a telescope on an airplane

Posted By Alex McConahay

Ben,

It is done all the time. Especially on the big groups going to view eclipses. It is important to pack everything well.

Remember, they take surfboards, and skis and golf bags on airplanes. So it isn't size you are worried about, generally.

And, I don't know where you are going, what kind of scope you will need, etc.....But-think out well whether you will need all that stuff.

Alex

February 1, 2005 05:47 PM Forum: Deep Sky Observing

Possible viewing list for February and March

Posted By Alex McConahay

And David, Don't forget the Messier Marathon!

Alex

February 1, 2005 05:51 PM Forum: Film Astrophotography - Imaging and Processing

Focus for film

Posted By Alex McConahay

Yes, they work. No, they are not perfect. But close to 95 per cent perfect (I have no idea where that number comes from besides my imagination!)--and that is pretty cost effective. They can get you close enought that other problems, like seeing, bad tracking, and such probably count as much as focus.

Alex

February 1, 2005 05:56 PM Forum: Star Parties

Star Parties or Group Meetings?

Posted By Alex McConahay

David,

Nobody has answered you yet.....Glacier Point is a spectacular place to observe. You can look both up and down. Set your scope out during the daytime and watch the climbers on Half Dome, then leave it up for the evening. It will probably draw a crowd. John Dobson and the Sidewalk crew were famous for having public outreaches there.

Most of the Valley camping area is covered in trees, and of course you have some limits on the horizon. But there are empty meadows, and you might find a parking area that could work (although in July you would have cars and lights.)

I have heard the Tioga road has several good places to observe, although I have not done so myself.

Alex

February 7, 2005 05:22 PM Forum: Meade

Meade Autostar and serial-USB cable...

Posted By Alex McConahay

I have done so. Works fine. The Serial-USB is just a generic cable.....Don't know the Brand name.

Alex

February 9, 2005 02:25 PM Forum: Politics

Re: Interesting information about the budget

Posted By Alex McConahay

Rod Kaufman said:

well we are not facing a superpower these days, are we?...

We are if you consider that we are our own worst enemy!

Alex

February 13, 2005 04:32 AM Forum: Beginning Astronomy?

Plans for d-i-y observatories wanted

Posted By Alex McConahay

Where are you located, Hans?

We are building some of those observatories and you are welcome to come look us over if you are nearby, or can just jet off wherever you want!

And as far as I know, 10x12 is as big as you can go without a permit. (I've heard 10 x 12 from a lot of places--but you may have something smaller. It is worth being sure locally.) That extra two feet does not cost much, but it is much bigger than 10x10.

ALex

February 15, 2005 11:14 PM Forum: Equipment Talk

Machine Shop

Posted By Alex McConahay

Where are you?

Alex