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The Majestic Clockwork

Created by Bristol Bristol  > 9 months ago, 7 Jul 2015
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Bristol
Bristol

ACT

347 posts

7 Jul 2015 5:01pm
There's something quite special happening in the evening sky at the moment, something to be shared with your children, grandchildren etc. If you want to observe clearly the movement of planets, do the following:-

At around 6pm, locate Venus. Look at an elevation of about 30 degrees above the western horizon. Venus will be easy to find. It is the second brightest natural object in the night sky; only the Moon is brighter. Having found Venus, observe that there's a bright object just below. That is the gas giant, Jupiter. Whilst it appears that the two planets are in close proximity, this is not the case. Our perspective from Earth makes them appear close. Jupiter is in the distant background to Venus, some 900,000,000 kilometres beyond (approximately).

If you've a good pair of binoculars and clear viewing conditions, you may be able to observe that Venus has phases, just like our Moon. It's in its crescent phase at the moment. You may also be able to see four of Jupiter's sixteen moons.

Now, here's the "wow" thing. Repeat the observations in about a month. Both planets will be lower in the western sky. The relative position of the two planets has clearly changed. They will be side-by-side, whereas before, they were one above the other. Venus is setting (getting closer to the western horizon). Jupiter is also setting, but because of the distance to it, its movements are not as pronounced. Having two bright objects to use as reference points makes the movement easily apparent.

FYI, the word "planet", of Greek origin, means "wanderer". The phrase "majestic clockwork" was coined to summarise the mathematics of planetary motion, discovered by Sir Isaac Newton.
pweedas
pweedas

WA

4642 posts

7 Jul 2015 3:08pm
Thanks for that.

I've been watching the two get closer over the last few weeks and wondered which one was the smaller one.
Now I know that the smaller one is actually the bigger one.

Venus is still very bright considering it's in the crescent phase. They must all have their lights turned on.
beastsurf
beastsurf

WA

902 posts

7 Jul 2015 5:08pm
Cheers for that Bristol. I will try to show the kids tonight.
Cal
Cal

Cal

QLD

1003 posts

7 Jul 2015 7:14pm
Yep, Venus has appeared particularly bright the last wee while, even my two year old understood what I was pointing at.
GavGav
GavGav

VIC

193 posts

7 Jul 2015 8:11pm
Bloody clouds!
Ian K
Ian K

WA

4164 posts

7 Jul 2015 7:37pm
Noticed them early evening a few days ago when they appeared even closer. Thought one must be Venus, didn't know what the other was.
r2908
r2908

NSW

214 posts

7 Jul 2015 10:06pm
7 days ago they were aligned . first time in 2000 years . some were calling it the the star of Bethlehem. Read something online about it .. I didn't see it but apparently was very bright .
Chook2
Chook2

WA

1249 posts

7 Jul 2015 8:41pm
I pinched part of your post Bristol and sent it to my mates. Thanks.

We had a fantastic orbit of the International Space Station that was visible here in Esperance WA and it passed right by the planets tonight.

Looked outstanding!!!!
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