Initially it was not my intention to make these sketches public but for two reasons a) I did observe some interesting phenomenon - the advancing limb of Venus after it left the solar limb was seen - seen by me quite clearly, and I hoped to check this again during the transit of 2012 but and b) in my present position I might not get this chance and also the clouds might just play the trick cover the sun. It would therefore be nice if others to may try sketch the event.
Transit of Venus
Predictions for Tehran, Iran
While making the sketches I had concentrated only that area where Venus was touching the solar limb. Though I 'looked around' I did not bother to sketch any other features such as sunspots nor do I remember if I saw any.
The time recorded was Tehran time but again was not very important It took me about 10 to 12 seconds to make a quick rough drawing and write time.
The telescope : Refactor 80 mm / f 900,
Eye piece 34 mm
15:28:30 Can't say seeing black drop
15:29 Solar limb appears to be pushed up
15:31:03 Noted it again
| Sketch 3|
15:31:30 may be black drop
Now this is interesting - on the limb the Venus is dark the, sky is dark too but distinct white curve seen about the bright solar limb.
It looked very much like the sun setting over the sea. The points where the Venus' disk was touching the solar limb appeared to be curve outwards.
15:35:00 - It is like sunset and the shimmering upper portion (as in Sketch 4) is gone now
I now see the sharp touch but it merged
15:38:30 A little curved here unlike sketch 7
Saw the advancing limb of Venus outside the solar limb - first I thought that it was a trick played by my eyes but then there were two very clear instances of this observations so I sketched this.
|Sketch 10 |
15:44:30 - It is not a half circle anymore but kind of two white curves from either sides
15:45:15 and 15:45:47 One more clear upper (half) ring and one shimmering for just for half a second or so
15:48 one more instance of the upper shimmering
A very clear notch was seen - the instances 12 and 13 were almost like mirror images but in negative.
Its gone now
Two pages from my note book on which I made my quick sketchs
|Pages form my small note book|