Posted by: lensweb | March 27, 2015

PARTIAL ECLIPSE OF THE SUN – 20 March 2015 ALAN HEATH

PARTIAL ECLIPSE OF THE SUN – 2015 March 20

2015_03_31_13_31An excellent view of the eclipse was seen at Long Eaton in almost perfect conditions.

Sky was slightly hazy but this was not a problem.

The Eclipse was observed mainly with the Celestron-8 at X50 but the photographs were taken with the 10-in (250mm) Reflector using an ‘Orion’ 8-in (200mm) Solar filter.

A total of eight photographs were taken using Kodak ISO 200 film.

For the convenience of visitors other telescopes were in use which included a Celestron-90 and a 2-in (50mm) Refractor set up to project the image into a dark box.

A view was also made using the Coronado Solar Max 40 at X 33 to view in Ha light.

BBC Radio Derby paid a visit and I made a live broadcast about the eclipse.

Richard Cliff (a visitor) took a number of photographs with his Canon Digital Camera using a Welder’s No 14 filter.

It was a very enjoyable eclipse in ideal conditions despite prediction of cloud. It did arrive just as the eclipse was over.

In addition to the observations, Light Intensity was measured throughout at approximately ten minute intervals using a photo cell coupled to a volt meter. Measurements made in milli Volts.    The light loss was well demonstrated

but it did not go as dark as we had expected.   The Sun was 90% covered at maximum.  At maximum it felt much cooler

than earlier and the sky did take on an eerie appearance, dimming but not going as dark as expected.

TEMPERATURE -08.00 UT     42°F

HIGHEST DURING DAY         51°F

BAROMETER –     Morning – 30.45”

Evening – 30.25”

PARTIAL SOLAR ECLIPSE –    2015 March 20
U.T. LIGHT INTENSITY PHOTOGRAPH
08.00 10 20 171 174 180
30 183 08.30
40 178
50 167
09.00 152 09.00
10 123
15 102
25 63 09.23
35 59 09.33 X2
40 67
45 98
50 125
10.00 161 09.59
10 190
15 215
20 253 10.20 X2
30 284
40 290
50 290
11.00 298

The SKY was clear until around 10.00 when some cloud was coming up but did not cover the Sun.

It was 4/8 cloud 10.20 and 6/8 cloud 10.40 when the eclipse ended.

The sky was overcast at 11.00

PREDiCTED TIMES OF THE ECLIPSE –     Start    08.25

Max     09.31

End     10.40

NOTE : There was a single Sunspot on the disc. The Moon had reached this spot at 09.13 and the spot had gone

at 09.13 1/2  The spot reappeared at 10.33 and was three sunspot diameters from the Moon at 10.35

ECLIPSE START at Long Eaton at 08.25 and ended at 10.41

Report by Alan Heath, 6 Harlaxton Drive, Long Eaton NG10 2ER


Responses

  1. Great record Alan and a privilege to view. Sorry I was not at your observation point.


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