Kwasan and Hida Observatories, Graduate School of Schience, Kyoto University japanese Home page
The partial eclipse on 14th Oct, 2004

The eclipse, which is literally the sun is shaded by the moon, has two types. One is the "total eclipse" or just "eclipse" which show the sun shaded completely, and the other is the "partial eclipse" in which we can see some portion of the solar disk is hided by the moon. The former one is very rare to happen but very important for the study of solar outer atmosphere. This time, we could observe the "partial eclipse" in Japan.

Here is a question. How much portion of the sun is shaded by the moon in your city? Since the line of sight to the sun is different when we stand different positions on the earth, the area of the shade is also different among different observers standing at different places. Let us see the area of the shade on the images obtained at Hida and Kyoto, in Japan, and find the difference.

The data obtained at Hida and Kwasan

Did you find the difference? Since the latitude is greater at Hida Observatory (36d 15' 01") than that of Kwasan Observatory (34d 59' 28"), the dark area is larger on the images taken at Hida observatory.

The detailed difference

The picture shows the image of the maximum of the partial eclipse at 11:35 JST (02:35 UT) obtained at Kwasan observatory, with the shape of the shaded solar disk which was observed at the Hida observatory overlayed. This clearly shows that the eclipse was greater in Hida than in Kwasan.
Start Maximum End
Kwasan Obs10:49JST11:35JST12:22JST
Hida Obs10:44JST11:35JST12:28JST
Extra image
Click to another images.
Next Solar Eclipse

This was the partial solar eclipse since two years and four months ago. The next solar partial eclipse will appear on 19th Mar, 2007 (unfortunately, this partial eclipse can not be seen in Kanto area).

On 22nd July, 2009, the total solar eclipse will be shown around "Amami-Ohshima" island. Because the duration of the "total eclipse" is expected to be more than 5 minutes, this must be the great chance to see the beautiful and fantastic solar atomosphere by eyes.

(Korori, H.)