Using Polaris and the Big Dipper to approximate local standard time

• 作者: Casey R. Watson Corey R. Page Edwin H. Kaufman Jr
• 来源期刊: 自然科学期刊(英文)
• 学科: 医学
• 关键词: POLARIS BIG DIPPER TIME LONGITUDE LATITUDE
• 年，卷（期）: 2012,（12）
• 页码范围: 1042-1055
• 页数: 14页
• 分类号: R73

摘要

In this paper we introduce methods for approximating local standard time in the Northern Hemisphere using Polaris and the Big Dipper as well as alternative reference stars, and describe in detail how to construct a device we call a dipperclock to facilitate this process. An alternative method which does not require a dipperclock is also discussed. Ways of constructing dipperclocks which glow in the dark are presented. The accuracy of dipperclocks is examined, both theoretically and through field testing. A java program is provided for creating dipperclocks customized to a particular year-long time period and place to get improved accuracy. Basic astronomical definitions and justifications of the results are provided. We also discuss the use of dipperclocks to find longitude and latitude.