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Last couple months we’ve seen some nice conjunctions of Jupiter and the Moon. On January  21st, they will come closest seen from the Earth. They would be seen about half a degree apart at the closest. As a comparison, the full Moon is about half a degree in diameter.

Here is a simulated view of the conjunction.


This conjunction is well placed seen from the western hemisphere, because it happens during the early part of night for this side of the Earth. The closest point being around 7:00 pm Pacific time.  If you remember the Moon moves almost 13 degrees in one day,the conjunction may not appear so close from the eastern hemisphere  unless you wait until late in night/early morning. In any case, don’t forget to look up at the Moon on 21st January 2013

This conjunction is also a good time to observe the movement of the Moon in the background of stars on the Ecliptic. Jupiter being farther away does not move much in a few hours. But the Moon is much closer, and also there is a the advantage of a bright Jupiter close by – So if you see the Moon at an hours interval a few times in the night, you will easily be able to see how the Moon has traveled towards East  in the background of stars.

A bonus this time is the conjunction occurs in a very star-studded region of the sky – surrounded by prominent constellations such as Orion, Taurus, Auriga and Perseus. And by the way, the orange-red star close to the Moon & Jupiter is Aldebaran, also known as Alpha Tauri in sky-terminology, and is the 4th nakshatra Rohini, in the Indian lunar Zodiac.


If you did not know, a nice planetary conjunction is coming up.

Watch the evening sky after the sunset for the next couple of weeks. Venus, and Jupiter, both very bright objects even from a light polluted sky are drawing closer.

On November 30/ December 1st, these two will be the closest. Don’t miss it – particularly so if you missed the conjunction of these planets early in the year in February 08.

Here is a simulation of the conjunction on YouTube.

And BTW, some people believe the “Star of Christmas” was indeed a very close planetary conjunction.


Today, July 09, 2008 – The big planet Jupiter is in opposition.

What does it mean?

Both the Earth, and Jupiter are on the same side of the Sun, and you can almost draw a straight line through them (Just for a moment assume all the three objects are in the same plane 🙂 )

If you were able to go far far away above the solar system, you will see something like this.

View from top

View from top

I guess you’ll have to click on the picture to see anything 🙂 The yellow dot is the Sun, the blue dot is the Earth and the green dot is the Jupiter.

So what?

You’ll see Jupiter for most part of the night. It rises around sunset, and sets around sunrise. Also, it is at its brightest, because it is at the nearest distance to Earth.

How to locate it?

Look in the Eastern/ South-Eastern sky about an hour after the sunset. You should see Jupiter as a brilliant white star. Glowing at magnitude of -2.7, there is no other star in the region which is as bright.

Here is a star map for those who are interested. Jupiter is in Sagittarius, just below the curvy Scorpious. Standing eastward, drop a straight line to the horizon from the bright red star Antares, and you will see Jupiter! Click on the image for a zoomed view.

Eastern sky in evenings - July 2008

Eastern sky in evenings - July 2008

These events are not rare events – Jupiter is in opposition once in about 400 days. But if you want to see Jupiter and it’s moons in a backyard telescope, this is probably the best time.


Feb 1st, 2008 marks the conjunction of Venus, and Jupiter -the first planetary conjunction of the year. A conjunction is an event where two objects in the sky appear to come closer. All the stars except out own sun appear as fixed objects because of their great distances. So, we need at least one object such as the moon, or a planet that we can see moving, to see a conjunction.

Conjuctions are only visual phenomena.  That means the two objects that appear close, appear so only because they are in the same line of sight as seen from the Earth. In space, the two obects could be located anywhere. When we are talking about a planet in conjunction with a bright star, one of the pair is obviously light years away 🙂

Given that both the orbits of Venus, and Jupiter are not very much tilted with respect to the Earth’s orbital plane (the ecliptic), the conjunctions of Venus and Jupiter are not all that rare. However, since these are the third and fourth brightest objects in our night sky (after the Sun and the Moon), it is always an interesting to watch.

To see Jupiter and Saturn, all you need to do is to wake up about an hour to ninety minutes before sunrise and look to the east-southeast direction. Make sure you are at a place where you can see the horizon. It is really hard to miss these two planets, which are shining at magnitudes of -4 and -2.  The brightest object you see in the eastern sky, low on the horizon is Venus. And the other bright object is Jupiter.

If you start observing the pair from today, you will notice that these are getting closer and closer everyday. And on February 1st, they will be the closest. About half a degree apart (which is about the apparent diameter of the moon).

Is this something that is very rare? No. But since this is happening at a time when Venus is close to it’s brightest, I definitely recommend you to wake up early and look at the pretty sight. Also at this time, the pair is a comfortable 30degrees away from the Sun ( That means, they rise about 2 hours before the Sun) thus providing a good view, before the morning twilight sets in.

That reminds me, that it was another planetary conjunction during in my elementary school days that got me hooked to skywatching. And, once you get to skywatching, there is never going back!

I have attachced a sky map to aid your watching. Just remember that the horizon is the left side of the map. You can see how close Venus and Jupiter would be on February 1st in this chart.

The star map on 1st February, 2008

And on 1st February, you will also see a waning cresent moon  a little higher in the sky, close to the bright red giant star, Antares (Jyeshta).  If Anteres was located where the Sun is located, we would be literally inside  😉 it.  This supergiant is so big , it would even take the orbit of Mars inside it’s body!

Happy planet hunting, and I wish you a happier life-long skywatching!



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