new photo blog

i started this blog in 2006, and it's shifted along with my interests through the years. it's been witness to a lot of learning for me...

still, i feel that i need a home for my photography -- so from now on, i'll be posting my pictures on the journal on my reworked website. if you like my photos, you might decide to follow me there!

my first post is here -- check it out!

as for this blog, i'm not sure what will happen. i don't think i'm willing to let it go, and certainly i'll keep it as an archive, but i need some time to figure it out.

for those of you that pop in from time to time, thanks for the visits and encouragement.

Saturday, September 24, 2011

a year of sunrises

i'm glad phil plait uploaded this video to youtube, as i saw it yesterday on the NASA earth observatory page. but was reluctant to do so.

'one of the most frequently misunderstood concepts in science is the reason for earth’s seasons. as we experience the september equinox today—anyone try to balance an egg yet?—we thought we’d offer a space-based view of what’s going on.

around 6 a.m. local time each day, the sun, earth, and any geosynchronous satellite form a right angle, affording a nadir (straight down) view of the terminator, the edge between the shadows of nightfall and the sunlight of dusk and dawn. the shape of this line between night and day varies with the seasons, which means different lengths of days and differing amounts of warming sunshine. (the line is actually a curve because the earth is round, but satellite images only show it in two-dimensions.)'

No comments:

Post a Comment