It could have something to do with limb effect (real vs mean
limb)
Luc
From occult 4.3.2.0 : (with limb effect)
S O L A R E C L
I P S E P R E D I C T I O N for 2017 Aug 21
East Longitude - 88 6.00
Latitude 37 4.10
Altitude 0 m.
TT-UTC 69.2 secs Prediction basis: DE430
UT1-UTC 0.2 secs ▲T [= TT-UT1] 68.9 secs
Event UTC P.A. alt. Differential
Corrections
h m s o o A
B C
First Contact 16 55 6 293 61 2.10 -0.59
-0.03
Baily beads @2nd 18 23 1
Second Contact 18 23 9.5 120.9
Maximum Eclipse 18 24 30 64 2.06 -1.25
-0.01
Third Contact 18 25 49.3 293.4
Baily beads @3rd 18 25 56
Last Contact 19 50 23 114 54 1.62 -1.68
0.01
[2nd and 3rd contacts are based on the lunar limb derived from
LRO LOLA]
Magnitude at Maximum Eclipse 1.013
Magnitude (diameter ratio) 1.031
_______________________________________________________________________________
without limb effect :
S O L A R E C L
I P S E P R E D I C T I O N for 2017 Aug 21
East Longitude - 88 6.00
Latitude 37 4.10
Altitude 0 m.
TT-UTC 69.2 secs Prediction basis: DE430
UT1-UTC 0.2 secs ▲T [= TT-UT1] 68.9 secs
Event UTC P.A. alt. Differential
Corrections
h m s o o A
B C
First Contact 16 55 6 293 61 2.10 -0.59
-0.03
Second Contact 18 23 11 122
Maximum Eclipse 18 24 30 64 2.06 -1.25
-0.01
Third Contact 18 25 50 286
Last Contact 19 50 23 114 54 1.62 -1.68
0.01
Magnitude at Maximum Eclipse 1.013
Magnitude (diameter ratio) 1.031
So I am chasing down an anomaly of the timing...
I was at
37.06769 -88.10091
which is down to a 1.112 meter
Nasa google maps showed totality begging at.
and guide8.0 showed the following:
I timed it at:
13:23:08
I wonder if it has something to do with leap seconds?
-- Bob Davis 9 Meadow Lane Exeter NH 03833 603-778-0781