2023美国天文奥林匹克竞赛-第一题[英文解析]

USAAAO 2023 - First Round February 11th, 2023

1. According to the astronomical Julian day count, JD 2459946.0 corresponds to January 1, 2023 at 12:00 UT. What would be the date and time at Chorzow, Poland corresponding to JD 2460000.0? 

提示：Poland uses the Central European Time (GMT + 1:00). 

(a) 31 January 2023, 24:00 

(b) 24 February 2023, 13:00 

(c) 21 March 2023, 14:00 

(d) 21 June 2023, 18:00 

(e) 31 December 2023, 24:00

答案分割线

Solution: 

The difference is exactly 54 days, so JD 2460000.0 corresponds to 24 February at 12:00 UT. Poland follows Central European Time, so we must add 1 hour to the Universal Time. 

Answer: B