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… shows map 1 of Heis’s star charts for observations of the Leonids from the year 1868. See also the article on page 167 in this issue on star charts for meteor observations by Ulrich Sperberg.
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… shows map 1 of Heis’s star charts for observations of the Leonids from the year 1868. See also the article on page 167 in this issue on star charts for meteor observations by Ulrich Sperberg.