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- Newsgroups: sci.astro
- Path: sparky!uunet!usc!sdd.hp.com!swrinde!gatech!cc.gatech.edu!cc.gatech.edu!mccricks
- From: mccricks@cc.gatech.edu (D. Scott McCrickard)
- Subject: Re: Bright planet in the evening sky
- Message-ID: <1993Jan10.010816.18015@cc.gatech.edu>
- Sender: news@cc.gatech.edu
- Organization: Georgia Tech College of Computing
- References: <726585130snz@cullen.demon.co.uk>
- Date: Sun, 10 Jan 1993 01:08:16 GMT
- Lines: 60
-
- In article <726585130snz@cullen.demon.co.uk>, Bobg@cullen.demon.co.uk (Bob Gregory) writes:
- |>
- |> I'm not an astronomical type so would one of you experts please satisfy
- |> my curiosity ?
- |>
- |> Thank you !
- |>
- |> Each evening at about this time of year one sees a very bright planet
- |> lying to the southwest from my position at around 52N. It is at, I would
- |> judge 45 to 50 degreed up from the horizontal. It is very bright.
- |>
- |> Is it Mercury ? Is it Jupiter ? I don't suppose it's Venus - that's
- |> called "The Morning Star", is that right.
- |> ...
-
- It's Venus. Venus is both the Morning Star and the Evening Star, depending
- on where the Earth and Venus are located wrt the sun. Currently, it is
- approaching its greatest eastern elongation, which will occur on January 19,
- at which time Venus, the Earth, and the Sun will form a right triangle (with
- Venus opposite the hypotenuse). Later in the year, Venus will have caught
- up and passed the Earth and will be seen in the morning sky (although I usually
- don't stay up late enough to see that). Anybody know the date? Of course,
- elongations don't happen at the same time every year; Venus orbits the sun every
- 225 days, so it depends on when Venus catches up with the Earth.
-
- Mercury is never that high in the sky, and never anywhere near that bright.
- As it is approaching superior conjunction (between the Earth and the Sun) you
- won't be able to see it at all.
-
- Jupiter has just passed quadrature (Jupiter, Earth, Sun formed a right triangle
- with the Earth opposite the hypotenuse) on January 3. You will see it if
- you are up past midnight.
-
- Mars reached opposition (aligned with the Earth and the Sun) on Jan. 7, so it
- rises (in the west) around sunset, and sets around sunrise. It's close to the
- twins, Castor and Pollux, in Gemini and forms an interesting red pair with
- Betelgeuse in Orion. You'll be able to see it better later in the month when
- the Moon moves.
-
- |> Whichever planet it is - how far from Earth at this time of respective
- |> orbits and what is the maximum and minimum respective distances from it
- |> to us at different times.
- |>
- |> Last, whichever it is, what distance please from the sun at aphelion, at
- |> perihelion.
- |>
-
- What?
-
- |> Thank you teacher
- |>
- |> Regards
- |>
- |> Bob Gregory
-
- --
-
- Not a problem.
-
- ---- D. Scott McCrickard (mccricks@cc.gatech.edu)
-