Indian Ocean trade Madagascar at this time leaving behind a lasting cultural and genetic legacy. Chinese fleets under Zheng He criscrossed the Indian Ocean during the early part of the 15th century. The missions were diplomatic rather than commercial, but many exchanges of gift and produces were made. The Portuguese under Vasco da Gama discovered a naval route to the Indian Ocean through the southern tip of Africa in 1497–98. Initially, the Portuguese were mainly active in Calicut, but the northern region of Gujarat was even more important for trade, and an essential intermediary in east-west trade. Venetian interests were directly threatened as
Time in Portugal Empire: although almost all continental Portugal is located west of the 7.5°W meridian (i.e. in the theoretical zone of time zone), for mainland Portugal it was adopted as its time zone. By the same law, time zone was adopted for the Azores and Cape Verde, for Madeira and Portuguese Guinea, for São Tomé and Príncipe and São João Baptista de Ajudá, for Angola, for Mozambique, for Portuguese India and for Macau and Portuguese Timor. These time zones were adopted on 1 January 1912. Daylight saving time ("Hora de Verão", in Portuguese) was observed for the first time in 1916, during