Star map produced in 1802 by the Shogunal astronomer Takahashi Kageyasu and its successor maps

Details Star map produced in 1802 by the Shogunal astronomer Takahashi Kageyasu and its successor maps Star map produced in 1802 by the Shogunal astronomer Takahashi Kageyasu and its successor maps

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rnaoj...8...85n&link_type=abstract

Report of the National Astronomical Observatory of Japan (ISSN 0915-6321), Vol. 8, No. 3 - 4, p. 85 - 110 (2005)

Astronomy and Astrophysics

Astronomy

Star Maps, History Of Astronomy

Scientific paper

Star maps delineated in the Edo period in Japan are roughly classified into two categories. The first, which is older, has its origin in three maps made by the first Shogunal astronomer Shibukawa Harumi in the latter half of the 17th century. To make up them, he referred to a Korean stone map inscribed in the 14th century. The second category is based on the Chinese star catalogs and maps that were compiled under the leadership of the Jesuit missionaries taking knowledge of the western astronomy into account, and imported into Japan around the end of the 18th century. In this report, we analyze in detail one map in the second category, Seiza-no Zu (Star Map) made in 1802 by the astronomer of the Shogunate, Takahashi Kageyasu. Kageyasu corrected stellar positions considering the precessional effects. On the other hand, at a recent museum exhibition for commemorating the famous historic cartographer Ino Tadataka, several new star maps (three circular and two rectangular ones) were on display which are ascribed to the Tadataka's grandson, Tadanori. From obvious similarity of Seiza-no Zu to the above two rectagular maps by Tadanori and his letters, we infer that Kageyasu as the Shogunal astronomer instructed Tadanori, then one of Kageyasu's students, to revise Seiza-no Zu by Kageyasu. Tadanori's maps and letters are important in that they bear concrete information and descriptions of how to make a star map. It is likely that at that time there used to be a project led by Kageyasu to compile a new star map as an enlarged revision of the ones given in Yixiang Kaocheng, and some star maps later published by Kageyasu's subordinate astronomers, such as Ishizaka Joken and Adachi Shinjun, were more or less influenced from Seiza-no Zu. We also discuss what Chinese star maps affected the drawing style of the three equatorial circular maps ascribed to Tadanori.

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