初学者 发表于 2025-4-1 05:07:40
http://reply.papertrans.cn/64/6334/633336/633336_61.pngLAVE 发表于 2025-4-1 06:57:40
ion. “From 1843 on” Otto tells us “Father’s personal participation in observing became rarer”.. To be sure, in that very year he led a chronometer expedition to determine the longitude difference between Pulkovo and Altona, and he continued for some years to use “his” prime-vertical instrument, as B