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Description
Johannes Kepler Life and LettersJohannes Kepler: Life and Letters was written as a biography of Johannes Kepler using his own letters. The letters extend over a period of time from 1596 to 1631 bringing to the reader Keplers' personality rather than his scientific achievements. The book represents his youth and years of apprenticeship, marriage and First scholarly achievements, the imperial mathematics at the Court in Prague, the Difficult Years in Linz and the Oddessy of the last
Johannes Kepler: Life and Letters was written as a biography of Johannes Kepler using his own letters. The letters extend over a period of time from 1596 to 1631 bringing to the reader Keplers' personality rather than his scientific achievements. The book represents his youth and years of apprenticeship, marriage and First scholarly achievements, the imperial mathematics at the Court in Prague, the Difficult Years in Linz and the Oddessy of the last four years incompassing 1948 to 1951.Binding Type: Hardcover
Publisher: Philosophical Library
Published: 01/01/1953
ISBN: 9780802200846
Pages: 220
Weight: 1.09lbs
Size: 9.00h x 6.00w x 0.63d
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4.3 ★★★★★
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Product Reviews
★★★★★ 5
It is durable! Lights still working after a month of use
This is the first ball that my dog hasn’t been able to break the lights!
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Reviewed in the United States on December 6, 2025
★★★★★ 5
Durable
Honestly I didn't think this ball would last but 2 years later and only one battery change later and it is going strong. This ball has given me so much more time to play with my dog since I can throw the ball at night on short winter days I can't recommend it enough. I can throw the ball at night and my dog can find it in the dark. Add a collar LED and it's a funny light show of one light intercepting another.
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Reviewed in the United States on February 26, 2026
★★★★★ 4
Great for pm at the park!
This is alot like Nite Eyez but not as good but if you have never used Nite Eyez you will love this!! I have an am. staff that i take to the park at night so she can run around without the fear of a dog running up on her (she doesn't like that) and this ball is great! Stays lit and changes colors and it she cant destroy it!
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Reviewed in the United States on November 1, 2025
★★★★★ 5
Works Great!
This is a new version of an old style that was the best most durable, and long lasting night time balls!!! They stay on long enough for me to find if my lab cant find it. (We have an acre backyard and in ground swimming pool) sometimes I have to retrieve it. Stays on and auto shuts off after inactivity. They ARE waterproof and we play in the pool with them on night swims. My lab is very hard on balls, very few hold hold up to his chomping on them. Great balls!!
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Reviewed in the United States on October 30, 2025
★★★★★ 1
not worth the cost
I love these balls for night time ball playing but they dont last. The last 4 Ive bought havent worked well or lasted more than a month. They were once worth the money
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Reviewed in the United States on April 1, 2026
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