描述Greenwich observatory laser.jpg	English: I took this picture of the laser at Royal Greenwich Observatory on the 5th September 2006. The Laser marks the zero meridian line and is projected northward over London.
日期	2006年9月8日 (原始上传日期)
来源	本檔案是由Alison使用CommonsHelper，從en.wikipedia轉移到維基共享資源。
作者	en:User:Markhamilton
授权 (二次使用本文件)	Public domainPublic domainfalsefalse 本作品已被作者英语维基百科的Markhamilton释出到公有领域。这适用于全世界。 在一些国家这可能不合法；如果是这样的话，那么： Markhamilton无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。Public domainPublic domainfalsefalse

原始上传日志

• 2006-09-08 01:27 Markhamilton 945×965× (248660 bytes) I took this picture of the laser at Royal Greenwich Observatory on the 5th September 2006. The Laser marks the zero meridian line and is projected northward over London. (Updated file has slightly better contrast). This image may be freely used
• 2006-09-07 18:27 Markhamilton 945×965× (139982 bytes) {{cc-by-sa-2.5}} I took this picture of the laser at Royal Greenwich Observatory on the 5th September 2006. The Laser marks the zero meridian line and is projected northward over London.