Kunitomo Ikkansai
Gunsmith · Japan · Scientists · Lived 1778 to 1840 · aged 62
Kunitomo Ikkansai is read about 29 times a day, in 9 languages.
A typical day, 30 days to 21 September 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 60 days, one point a day.
Something wrong?Kunitomo Ikkansai , real name Kunitomo Tōbee Yoshimasa , was a Japanese gunsmith and inventor of the late Edo period, who, after having spent several months in Edo, where he could get accustomed with Dutch wares, built Japan's first reflective telescope in 1831.
Also in Deutsch
Photos 4
About this person
Kunitomo Ikkansai , real name Kunitomo Tōbee Yoshimasa , was a Japanese gunsmith and inventor of the late Edo period, who, after having spent several months in Edo, where he could get accustomed with Dutch wares, built Japan's first reflective telescope in 1831. It was of the Gregorian type and had a magnification of 60. He used it to make very detailed studies of sun spots and lunar topography. Four of his telescopes remain to this day.
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