QUES: The first lighting used on an airport was during the latter part of the 1920s; in the 1930s approach lighting came into use. These indicated the proper direction and angle of descent. The colours and flash intervals of these lights became standardized under the International Civil Aviation Organization (ICAO). In the 1940s, the slope-line approach system was introduced. This consisted of two rows of lights that formed a funnel indicating an aircraft's position on the glideslope. Additional lights indicated incorrect altitude and direction.

What did the flash interval system consist of?
What is the answer?
ANS: unanswerable
QUES: The party was a member of the Labour and Socialist International between 1923 and 1940. Since 1951 the party has been a member of the Socialist International, which was founded thanks to the efforts of the Clement Attlee leadership. However, in February 2013, the Labour Party NEC decided to downgrade participation to observer membership status, "in view of ethical concerns, and to develop international co-operation through new networks". Labour was a founding member of the Progressive Alliance international founded in co-operation with the Social Democratic Party of Germany and other social-democratic parties on 22 May 2013.

What was the party a member of before 1923?
What is the answer?
ANS: unanswerable
QUES: Spanish colonization commenced on June 15, 1668 with the arrival of Diego Luis de San Vitores and Pedro Calungsod, who established the first Catholic church.:64 The islands were part of the Spanish East Indies governed from the Philippines, which were in turn part of the Viceroyalty of New Spain based in Mexico City. Other reminders of colonial times include the old Governor's Palace in Plaza de Espana and the Spanish Bridge, both in Hagatna. Guam's Cathedral Dulce Nombre de Maria was formally opened on February 2, 1669, as was the Royal College of San Juan de Letran.:68 Guam, along with the rest of the Mariana and Caroline Islands, were treated as part of Spain's colony in the Philippines. While Guam's Chamorro culture has indigenous roots, the cultures of both Guam and the Northern Marianas have many similarities with Spanish and Mexican culture due to three centuries of Spanish rule.

On what date did Spain colonize the Philippines?
What is the answer?
ANS:
unanswerable