How to find direction?

Got a question on astronomy that you'd wanted to ask? Ask your questions here and see if the old timers can give you some good answers.
Post Reply
User avatar
Extraterrestrial
Posts: 8
Joined: Sat Jul 17, 2004 11:47 am

How to find direction?

Post by Extraterrestrial »

Hi,

New here. New to stargazing. I've got a question:

Since Polaris & Southern Cross are so low in Singapore. Is there any easy way to find direction without a compass at night?
User avatar
gwenyi
Posts: 233
Joined: Wed Oct 01, 2003 7:28 pm
Location: Holland Close

Post by gwenyi »

the southern cross is easily visible over here, so it shouldn't be problem locating it even thought it is quite low. The bottom star(alpha crucis) will show u the direction t. Simply in line ur hand with the bottom star and draw a line until it hits the horizon and that will be south.



cheers,
wenyi
User avatar
fizzy123
Posts: 680
Joined: Sun Jan 18, 2004 12:47 pm
Location: Tampines

Post by fizzy123 »

Hi extraterrestrial, welcome to the forum.

To answer ur question, in the first place u can actually see the southern cross ( a.k.a. crux). in Singapore. If u hav a clear unobstructed horizon or observe from rooftop.

1) Crux and the little dipper is known as circumpolar constellation, which mean to say u can see both constellations regardless of wat month it is. These two constellations are near the south celestial pole n north celestial pole respectively.

2) To find south pole, draw an imaginary line from gamma cruxis to Acrux. Draw an imaginary line to perpendicularly bisect the 2 stars Alpha n Beta Centauri. The point of intersection is veri near south pole. There is a veri faint star known as sigma octantis near SCP.

3) To find north pole, identify big dipper first. Draw an imaginary line through stars, Merak n Dubhe n u get to pole star polaris. :wink: :roll: 8) :lol:



P.s. I know this sound a little 'chim' but never mind slowly learn the constellations n soon u will be navigating through the celestial. sea. :wink: :wink: :wink: :lol: :lol:
User avatar
kayheem
Posts: 1039
Joined: Tue Sep 30, 2003 9:59 am
Location: Sennet Estate

Re: How to find direction?

Post by kayheem »

Extraterrestrial wrote:Hi,

New here. New to stargazing. I've got a question:

Since Polaris & Southern Cross are so low in Singapore. Is there any easy way to find direction without a compass at night?
If your north and south are blocked, the sword of Orion forms a line in the North-South direction (head towards north)

If the sky is cloudy, check the road directory. The light pollution is so bad here that you should not have problems reading it :-P

Kay Heem
User avatar
Extraterrestrial
Posts: 8
Joined: Sat Jul 17, 2004 11:47 am

Post by Extraterrestrial »

Thanks for the replies. :D
Actually I have read about crux & ursa minor recently. I bought the book "The Stars: A new way to see them" by H. A. Rey. But since the book was written for ppl in high latitudes, was wondering how to apply the technique in singapore. So now I know we can actually see the cross & big dipper here. I was worried that our city light would drown the horizon.

Have been wanting to look at the sky, but it's always cloudy.

Hope to join you guys for some stargazing. Are those SP Obs sessions open to public? I stay in Holland Rd, so SP is really convenient. I am just worried that I'm over-aged. :?:
User avatar
gwenyi
Posts: 233
Joined: Wed Oct 01, 2003 7:28 pm
Location: Holland Close

Post by gwenyi »

haha no worries about being over-aged. yeah, sp ob sessions are opened to the public every friday.


cheers,
wenyi
User avatar
Sam Lee
Posts: 373
Joined: Tue Oct 07, 2003 6:54 pm
Location: Woodlands
Contact:

Post by Sam Lee »

Yup, no worries. We're open even to ETs :lol: :lol: !!
Looking forward to meeting you in one of the fridays session.

Contact me at 91837064 if you like to join in! :D

Regards,
Sam
We are the Borg, Resistance is Futile!
User avatar
luke5v8
Posts: 57
Joined: Thu Jul 08, 2004 4:02 pm
Location: Woodlands
Contact:

Post by luke5v8 »

Sam, u mean u are present at every Sp ob :?: does it starts so early at 6pm :?: :?: I'm working at ayer rajah ind est but my work ends at 6 leh...
wat time does every ob session ends :?: :?: :?:
Image
User avatar
MooEy
Posts: 1275
Joined: Sat Oct 04, 2003 6:24 am

Post by MooEy »

find setting/rising planets/moon/sun. everything in the sky moves from east to west.

~MooEy~
User avatar
Sam Lee
Posts: 373
Joined: Tue Oct 07, 2003 6:54 pm
Location: Woodlands
Contact:

Post by Sam Lee »

<sorry for the off-topic>

luke5v8,

I'm a sp student, so naturally i'll be there for the friday sessions. Usually we will hang around our clubhouse first as early as 5pm (All classes ends then). Then we'll have dinner together before checking out the sky. If its good, then we're in business. If not, we'll either slack in the clubhouse or make our way to the pool centre in clementi for a game or two before going back. There's no way to tell when we are going to end. If the observation is on, then we'll sometimes rush to catch the last train. Usually its around 10+pm.

Regards,
Sam
We are the Borg, Resistance is Futile!
Post Reply