dotancohen

1,004 reputation

213

bio	website	dotancohen.com
	location
	age	35
visits	member for	1 year, 9 months
	seen	May 9 at 8:32
stats	profile views	57

	1,004 reputation	bio	website	dotancohen.com	visits	member for	1 year, 9 months
213 badges		location			seen	May 9 at 8:32

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Oct 24	comment	Maximum resolution per lens size Thanks John! I did realize that a larger lens lets in more light, but I was unaware of spherical aberration.
Oct 24	comment	Maximum resolution per lens size I see, thanks. You've given me the keywords that I do need to continue research. I want to see how far they are pushing this poor lens. However, how is quality reduced as lens size is reduced? All the professional camera have large lenses, surely there is some advantage to a larger lens.
Oct 24	asked	Maximum resolution per lens size
Oct 12	comment	Lowest gravity on Earth's surface? Thank you Dimuthu!
Oct 12	accepted	Lowest gravity on Earth's surface?
Oct 12	accepted	Gas pressure equalisation: Where does the excess energy go?
Oct 2	comment	Will a hole cut into a metal disk expand or shrink when the disc is heated? This is analogous to the reason that the holes in cookies get smaller, not larger, when baked.
Oct 2	answered	Does Earth's rotation change at a constant rate?
Oct 2	comment	Gas pressure equalisation: Where does the excess energy go? Thanks John. The microscopic explanation of the gas molecules' speed was quite what I was missing. If Zephyr doesn't write back as an answer then I'll accept this one.
Oct 1	asked	Gas pressure equalisation: Where does the excess energy go?
Sep 21	awarded	Custodian
Sep 17	comment	Do any naked-eye stars have planets Thanks. I did know that some doubt had been shed on the existence of the planet.
Aug 17	comment	How empty of fuel are spacecraft booster rockets typically? Thank you. You briefly mention a safety factor of 1.1. Does that mean that roughly 9% of the launch fuel remains?
Aug 17	revised	How empty of fuel are spacecraft booster rockets typically? added 4 characters in body
Aug 17	asked	How empty of fuel are spacecraft booster rockets typically?
Aug 10	awarded	Yearling
Jul 31	comment	Does Earth have a code name? I think that the font issues are due to your browser, not the site: ⊕
Jul 30	revised	Will Pluto be in the ecliptic plane when New Horizons passes by? Was this deliberate? edited title
Jul 24	answered	Gas Cylinder Life
Jul 24	comment	How did Cook and other astronomers time the 1769 Venus transit? Land-based longitude had its own set of problems, mainly how to transport the clocks (not a problem for Cook). Land navigation was done using Lunar methods even after the seafarers switched to clocks.