Dyffransow ynter amendyansow a "Rol a dus a Gernow"

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==Dismygysi ha Godhonydhyon==
* [[John Couch Adams]]: a dhiskudhas an [[planet]] [[Nevyon ]]
* [[John Arnold]]: gwrier euryoryon, dismygyas an ''chronometer''
* [[William Bickford]]: a dhismygas teudherik diogeledh
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