neilparker62's latest activity

Alas - I will need to take responsibility for the above "solution" - the stated aim was to construct ##\sqrt{5}##. I don't necessarily...

Well here's the construction of ##\sqrt{5}## anyway. Courtesy of Google Gemini.

Presumably you can always construct ##\sqrt{b}## by drawing a circle with diameter b+1 and placing a perpendicular at b to intersect the...

I had an overnight revelation about this. It should resonate with any person who has been sensitized to the importance of units. Here it...

Just a cellphone pic but managed to pick up 3 planets - Venus, Jupiter and Mercury. You might need to zoom in on the pic to see Mercury...

Very tactfully put by Descartes! Nicolaus Copernicus in a header page of De Revolutionibus Orbium Coelestium writes somewhat more...

I think inventing the geometric construction was the big accomplishment. We are left merely with the pleasure of showing that it works...

I would think that Descartes used similar triangles to finish this purely geometric that can be constructed with ruler and straight edge...

Let D be the point where the perpendicular meets AB. Then: $$\triangle ADC \sim \triangle CDB \implies \frac{h}{b}=\frac{a}{h} $$

If you look deep enough into space and time , it seems just about everything you see is a galaxy...

I know! It's sobering to contemplate the vastness and our insignificant place in it. I typically run the image through Astrometry.net...

So many galaxies! Hard to imagine the scale involved. Could some of the "stars" we are seeing also be galaxies. Maybe just smaller or...

Should be a much bigger global concern than it is - 'climate change' is now "verba non grata" and the BBC article seeks to allay our...

Ok thanks - that gives an idea of its relative size. About 11 times Earth diameter. And Earth's diameter (12742km) in turn is a bit more...

No sooner did I share the Virgo panorama than we just had 10 consecutive nights of clear skies. I used most of those to complete the...