| January 26 Contrail Shadow | | | |
|
|
|
| Contrail shadow | | Jet contrail shadows appear to be cast by a low-altitude bright light shining upwards. In fact, the light source is the sun, and the shadow is cast downward on clouds below. | | | Tonight … Can you see Achernar? | | This bright star marks the end of the River Eridanus. Many at northerly latitudes make a game of trying to catch a glimpse of it. | | | | | | | |
|
|
|
|
|
|
| | | Contrail shadow | This photo - captured January 20 by Don Spain in Hillview Kentucky - shows a contrail shadow plus one other atmospheric phenomenon. If you look closely, you'll see a little tangent arc - a little arc of light - to the right of the shadow, near the bottom of the photo. Info about tangent arcs here. | | | | |
|
|
| | Tonight … Can you see Achernar? | It's bright, but you need to be far south - the latitude of the far-southern U.S. or below - to glimpse it. | | | |
|
|
|
No comments:
Post a Comment