Term-day magnetic observations from the Prague-Clementinum observatory on 1844-08-31

Data of term-day observations recorded at the Prague-Clementinum observatory in years 1840-1849 are presented. The data were obtained by digitising and processing the original old records published in the yearbooks of this historical observatory. The term-day observations had been agreed for joint measurements by the observatories organised in the Göttingen Magnetic Union (GMU). Data of 120 term-days from January 1840 to December 1849 are published. The observations started at 10 p.m. of Göttingen Mean Time and lasted 24 hours. The interval between observations was 5 minutes (in April, June and July 1842 exceptionally 6 minutes). All time data were transformed into UT, based on the longitude of the Göttingen observatory, which was 9.950°. The time shift is thus 39'48''. The date in the term-day file name indicates the second day which involves substantial part of the observations (22 out of 24 hours).

本文呈现了1840年至1849年间于布拉格克莱门特天文台（Prague-Clementinum Observatory）记录的跨日时段观测（term-day observations）数据。该数据集通过对该历史天文台年刊中刊载的原始老旧观测记录进行数字化与加工处理后获得。此类跨日时段观测是由哥廷根磁学联合会（Göttingen Magnetic Union, GMU）组织的各天文台约定开展的联合测量项目。本数据集收录了1840年1月至1849年12月间共计120组跨日时段观测数据。观测以哥廷根平均时间晚10时启动，持续时长为24小时。观测间隔为5分钟；1842年4月、6月及7月例外，观测间隔调整为6分钟。所有时间数据均基于哥廷根天文台的经度（9.950°）转换为世界时（Universal Time, UT），对应的时间偏移量为39分48秒。跨日时段观测数据文件的文件名中所标注的日期，代表包含本次观测绝大多数时长（24小时中的22小时）的次日。