[meteorite-list] OT - Happy Crab Nebula Day!

From: MexicoDoug <mexicodoug_at_meteoritecentral.com>
Date: Mon, 04 Jul 2011 23:15:42 -0400
Message-ID: <8CE08D8ECA78362-1B44-44D5F_at_webmail-d139.sysops.aol.com>

It ought to be Julian since that was in effect ... or else all the
references would have to say something about the re-adjustment of the
date, but that's just an opinion! In astronomy, generally the 1582
conversion is respected by astronomers if I recall - I.e., before that
time events are on the Julian Calendar, and afterwards Gregorian, even
if they nation of the observation was still on the Julian date; usually
that doesn't matter and by convention the expression I time I believe
changes in 1582. Jean Meeus's incredibly useful books, if I had them
would have an excellent discussion of the subject, but I don't have my
references with me. Some other list member could look it up as Meeus'd
be the expert.

Best wishes
Doug

-----Original Message-----
From: Patrick Wiggins <paw at wirelessbeehive.com>
To: MeteorList <meteorite-list at meteoritecentral.com>
Sent: Mon, Jul 4, 2011 10:12 pm
Subject: Re: [meteorite-list] OT - Happy Crab Nebula Day!


I've often wondered and maybe someone here can answer.

Since 1054 was long before the 1582 conversion from the Julian to
Gregorian
calendar, is the July 4 date that gets mentioned for the first sighting
of
supernova a Julian date or has it been converted to Gregorian?

???

patrick


On 04 Jul 2011, at 10:25, Gary Fujihara wrote:

> Cosmic Fireworks: On July 4, 1054, Chinese astronomers observed a
"guest star"
in the constellation Taurus, the result of a star exploding or going
Supernova.
At mag -6, SN1054 (Supernova of 1054) became about 4 times brighter
than Venus,
was visible in daylight for 23 days, and lasted a period of two years.
Today we
can still see remnants of SN1054 as the Messier Object 1 (M1) Crab
Nebula.
>
> http://bigkahuna-meteorites.com/_M1.jpg
>
> Oh, and for those terrestrially bound in the USA, Happy Fourth of
July!
>
> Gary Fujihara
> Big Kahuna Meteorites (IMCA#1693)
> 105 Puhili Place, Hilo, Hawai'i 96720
> http://bigkahuna-meteorites.com/
> http://shop.ebay.com/fujmon/m.html
> (808) 640-9161
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Received on Mon 04 Jul 2011 11:15:42 PM PDT