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My Uranometria is making me feel old....

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#1 Michael Rapp

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Posted 18 May 2020 - 06:00 PM

While opening my Uranometria, I happened to grab it such that the title page opened up.  I typically don't look at this page often, but it holds one of my most treasured astronomical memories.  At the Texas Star Party in 1999 (the only time I've ever been), I met Stephen James O'Meara and had him sign it.  (Yes, he doesn't have anything to do with the atlas, but it is what I had with me!)

 

I noticed that I am now older than Stephen was when he signed this!  Wild.

 

IMG-3929.JPG


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#2 Astroman007

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Posted 18 May 2020 - 06:08 PM

Cherish it! Wonderful memories indeed. I am sure we all have at least one such memory tied to a given piece of gear.



#3 George N

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Posted 21 May 2020 - 01:59 PM

I had Wil Tirion autograph my 2nd /Ed copies ( and the field guide ) many years ago at NEAF!


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#4 clearwaterdave

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Posted 22 May 2020 - 07:09 AM

Very cool beans.,!!!



#5 rockethead26

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Posted 22 May 2020 - 11:52 AM

That was my first TSP! Nice autograph!


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#6 astro744

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Posted 22 May 2020 - 09:42 PM

By your title I thought you meant that the years have slipped by and that after 2025, the preferred epoch will be 2050.  I guess it’s time for some new charts soon.



#7 faackanders2

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Posted 22 May 2020 - 10:08 PM

By your title I thought you meant that the years have slipped by and that after 2025, the preferred epoch will be 2050.  I guess it’s time for some new charts soon.

How much would they really change?  The have a seperate page for Bernards star which moves the most., but everything else is magnitudes less.



#8 astro744

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Posted 22 May 2020 - 10:47 PM

It’s not so much the proper motion of the stars that is the issue but rather the precession of the Earth’s axis of rotation.  It’s about 50 arc sec per year.  The Epoch prior to J2000 was B1950.  I bought my Sky Atlas 2000 first edition in 1986 and it was to J2000.  I remember Norton’s Star Atlas was available at the time to B1950.  I have a set of Becvar’s atlases and these are also B1950.

 

The next epoch that star charts will be referenced to is 2050.  The ‘current’ epoch is the position of an object at the present date and the correction is added to the J2000 reference.

 

I am feeling old to because when I bought my first chart it was 14 years prior to 2000 and now it and Uranometria will soon be 25 years past 2000 and less than 25 years to the next epoch.

 



#9 Andrekp

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Posted 24 May 2020 - 10:24 AM

By your title I thought you meant that the years have slipped by and that after 2025, the preferred epoch will be 2050.  I guess it’s time for some new charts soon.

yes but for a few years your epoc 2000 charts won’t be much more inaccurate than your Epoc 2050 charts.  I’d say if your 2000’s aren’t causing issues for you now, then they probably won’t magically start doing so in five years.  Especially since so many people with the scopes to seek out the hard stuff star-hop anyway.



#10 astro744

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Posted 24 May 2020 - 10:47 AM

No not causing me any issues.  I was merely commenting on the passage of time as measured by star chart reference epochs.




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