You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
3.7 KiB
75 lines
3.7 KiB
15 years ago
|
From rabaca@nova.ov.ufrj.br Fri Oct 20 23:12:11 2000
|
||
|
|
Return-Path: <rabaca@nova.ov.ufrj.br>
|
||
|
|
Delivered-To: coolo@master.kde.org
|
||
|
|
Received: (qmail 22568 invoked by uid 1055); 20 Oct 2000 21:12:11 -0000
|
||
|
|
Delivered-To: kde.org-coolo@kde.org
|
||
|
|
Received: (qmail 22489 invoked from network); 20 Oct 2000 21:12:07 -0000
|
||
|
|
Received: from nova.ov.ufrj.br (root@146.164.112.17)
|
||
|
|
by max.tat.physik.uni-tuebingen.de with SMTP; 20 Oct 2000 21:12:07 -0000
|
||
|
|
Received: from localhost (localhost [[UNIX: localhost]])
|
||
|
|
by nova.ov.ufrj.br (8.9.3/8.9.3) id TAA09140
|
||
|
|
for coolo@kde.org; Fri, 20 Oct 2000 19:14:00 -0200
|
||
|
|
From: Carlos Roberto Raba<E7>a <rabaca@nova.ov.ufrj.br>
|
||
|
|
Reply-To: rabaca@nova.ov.ufrj.br
|
||
|
|
Organization: Observatorio do Valongo - UFRJ
|
||
|
|
To: Stephan Kulow <coolo@kde.org>
|
||
|
|
Subject: Re: Moon tool
|
||
|
|
Date: Fri, 20 Oct 2000 17:10:39 -0200
|
||
|
|
X-Mailer: KMail [version 1.0.29]
|
||
|
|
Content-Type: text/plain
|
||
|
|
References: <00102016004500.08951@nova.ov.ufrj.br> <39F09247.5715C35D@kde.org>
|
||
|
|
In-Reply-To: <39F09247.5715C35D@kde.org>
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Message-Id: <00102019130700.09050@nova.ov.ufrj.br>
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
Status: O
|
||
|
|
X-Status:
|
||
|
|
|
||
|
|
Stephan,
|
||
|
|
|
||
|
|
> In KDE2 I implemented free choice view angle, so I could also slide
|
||
|
|
> it some degrees off to see it like I see it here :)
|
||
|
|
|
||
|
|
It is nice to hear that! Unfortunately, I still use KDE 1.1.2.... By the way,
|
||
|
|
when is the final release o 2.0?
|
||
|
|
|
||
|
|
> But if you're an expert, I would like your advise on the correct
|
||
|
|
> terms. Where on the earth you see the moon in the the default view
|
||
|
|
> you can see on web pages etc.?
|
||
|
|
|
||
|
|
As you know, the moon keeps always the same face turned to earth (the so called
|
||
|
|
near side). This is a composition of its period of orbital motion and rotation:
|
||
|
|
they are approximately the same. The moon's orbit is inclined with respect to
|
||
|
|
the equator by (only) 5 degrees, and for our purposes, keeps the polar
|
||
|
|
orientation in the sky unchanged. This means that the angle that you
|
||
|
|
see the moon in the sky changes by a composition of two factors only: 1)
|
||
|
|
latitude of the observer, and 2) time of the day that you look at the moon. If
|
||
|
|
you look at the moon over many hours, the change of orientation in the sky is
|
||
|
|
moon's orbital plane is close to the equator (as I said before) the discussion
|
||
|
|
of orientation looses any meaning. At these positions, the passage by the
|
||
|
|
meridian happens very close to the top of your head. So, I can be facing east
|
||
|
|
and move my head up to see the moon, or I can be facing west and move my head
|
||
|
|
up. Which rotation should I addopt? That is why I told you to use 0 or 180
|
||
|
|
degrees. Otherwise, you would need to incorporate in your code many otherif he
|
||
|
|
relations, including the latitude of the observer.he will see the first quarter
|
||
|
|
moon as a C and the last quater moon as a D (see
|
||
|
|
> The current kmoon uses the pictures of this site:l) when the moon is over
|
||
|
|
> http://timbeauchamp.tripod.com/moon/, but a (german) colleague ofes over his
|
||
|
|
> yours pointed out that the images are mirrored horizontally, son is reversed.
|
||
|
|
> we corrected that (the larger craters appear on the left ontor. Since the
|
||
|
|
> the moon I see in the sky, while they are right on the web).
|
||
|
|
|
||
|
|
My colleague is correct. The east-west sides in the pictures are wrong, so you
|
||
|
|
should flip them sideways. For an observer in the northern hemisthere this is
|
||
|
|
all you need to do. For an observer in the southern hemisphere, you need to
|
||
|
|
rotate this new set of images by 180 degrees. Keep in mind that in the sky if
|
||
|
|
north is up east is to the left, if south is up east is to the right. You can
|
||
|
|
easily see this if you lay down ;-/ on the floor with you head/legs pointing to
|
||
|
|
the north/south line. Now, try to point your left arm to the geographic
|
||
|
|
east while facing up.
|
||
|
|
|
||
|
|
I hope this helps you. If you like more info, it will be a pleasure to
|
||
|
|
help. Best wishes,
|
||
|
|
|
||
|
|
Carlos
|