Rules of the Air Article 23
Except as provided by Aritcle 24, from sunset to sunrise or in the daytime when visibility is less than 5 km, all aircraft in flight or operating on the manoeuvring area of an aerodrome shall display anti-collision lights and navigation lights.
中文原文 飛航規則第23條
除第二十四條規定外，從日落到日出間或能見度低於五公里之白晝，在飛航中及機場活動區內活動之航空器，均應開啟其防撞燈及航行燈。