If you live in the Northern Hemisphere, finding north using the stars is fairly easy.
Because the north pole of the Earth points relatively close to the star Polaris (meaning “Pole Star”), when you face that star, you are facing north.
To find Polaris, first find the bright stars of the Big Dipper, the well-known asterism located in the constellation Ursa Major (the Big Bear).
Starting with the two right stars in the “bowl” of the Big Dipper, draw a line using those stars above the bowl until you come to a bright star. This is Polaris. This is an easy way to find north.
The Changing North Star
But the Polaris hasn’t always been, nor will it always be, the North Star.
In the following video I explain why this is.
The reason why the Polaris will not always be the North Star is because of “axial precession.” The tilted axis of the Earth won’t always be pointing in Polaris’ direction in space. We just happen to live at a point in history when this is the case.
Slowly, over a very long period of 26,000 years, the tilted axis of the Earth changes its orientation, much like the axis of a top wobbles as it spins around.
This means the pole of the Earth won’t always point in the direction of Polaris.
- By 7500 AD, we’ll probably be using the star Alpha Cephei as our North Star.
- By 11500 AD, we’ll be using Delta Cygni to find north.
- By 14000 AD, we’ll be using the very bright star Vega as our North Star.
- By 23000 AD, we’ll be using the dim star Thuban.
Thuban, by the way, was the star the ancient Egyptians used 5000 years ago as their North Star. In the year 2787 BC is was almost exactly at the point of celestial north.
Learn More About Precession
Below is a sample portion of one of the lessons I teach in our online course, Experience Astronomy. The video is a lengthier explanation of axial precession.
Your Kids Can Learn Astronomy!
If your child loves learning about how astronomy impacted ancient (and modern) cultures, they will love Experience Astronomy.
We cover so much in these full-school-year online courses. Students learn about…
- How to identify major constellations
- Ways astronomy connects to fascinating stories in history, literature, folklore, archaeology, and the Bible
- The amazing world of interstellar space—stars, galaxies, black holes, and exoplanets
- How ancient people used astronomy to tell time, create calendars, and navigate the globe
Best yet: I do all the teaching for you through fun, engaging online videos and hands-on activities.
Dear Luke Gilkerson:
Re. “Thuban . . . In the year 2787 BC is was almost exactly at the point of celestial north.”
Many Internet sources cite this date — 2787 BC — for Thuban’s closest approach to the CNP; i.e.,
http://earthsky.org/brightest-stars/thuban-past-north-star
http://www.adrianellis.co.uk/anomalies/anomalies/the-great-pyramid-2787BC.html
The Star Atlas Companion: What you need to know about the Constellations – Philip M. Bagnall – Google Books P 207
However, many other sources — such as
https://en.wikipedia.org/wiki/Thuban (referencing Moore, Patrick (2005). “The Observer’s Year: 366 Nights in the Universe”. p. 283)
cite 2830 BC as Thuban’s closest approach to the CNP.
I would be very grateful if you could provide a primary source and/or how I might establish the date accurately.
Sincerely,
Mike Jordan
Thanks! McClure did indeed cite 2787 BC for theThuban-CNP appulse but, again, with no source. Pretty sure I asked him about it but received no reply. YourSky indicates 2798 BC. If anybody knows how to pin it down I’d appreciate an email at timeround@aol.com
After reading this article, is it safe to assume that you have an old earth belief system?
Thank you for your time.
Precession of daily rotation and moon around the earth is not a smooth ride, it is a very wobbly calculation
Satan was on earth 1266 years (456,000 days). So STUDY: of the star Thuban (drifting closer to pole and then backing further away) Did Satan start the the Great Pyramid (first phase main shaft) before the Flood?
The dates match so it is possible Satan (Alulim the first ruler of the Great Brothers, or Great Elders) started it in 3340bc (970-year rule contemporary with Methuselah) before it was taken up again in 2170bc. However, that would imply no Earth axis-shift caused by Flood asteroid impact; only a rotation speed increase. The magnetic pole defies that because the new axis is pulled away from the old magnetic pole, and so that magnetic pole is now rapidly headed toward the new axis. AND a 3340bc pyramid shaft would imply a highly-improbable continent retaining its horizontal level thru the Flood baptism.
Compare faulty 2787bc (3404bc +617 = 2787bc + 617 =2170bc
to Atlas 3490bc +660 = 2830bc +660 = 2170bc