Term-day magnetic observations from the Prague-Clementinum observatory on 1846-06-25@en

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).本数据集呈现了1840年至1849年间在布拉格克莱门特天文观测台（Prague-Clementinum Observatory）记录的日界观测（term-day observations）数据。该数据集通过对该历史观测台年鉴中刊载的原始老旧观测记录进行数字化与处理后得到。本次日界观测由哥廷根磁学联合会（Göttingen Magnetic Union, GMU）旗下各观测台协商开展联合测量。本数据集共收录1840年1月至1849年12月期间的120个日界观测日的数据。观测以哥廷根平均时间的晚上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月和7月例外，间隔为6分钟。所有时间数据均基于哥廷根观测台的经度（9.950°）转换为世界时（UT），因此需进行39分48秒的时间偏移。日界观测文件名中的日期代表包含观测主要时段（24小时中的22小时）的次日。