How did the invention of the astrolabe vasco da gama make his voyage to india? it allowed him to navigate the seas using the sun and stars. it allowed him to create a map to other sailors return to asia. it allowed him to use the winds to return from longer journeys. it allowed him to scare off anyone who would try to attack his ship.

It allowed him to navigate the seas using the sun and stars.

Explanation:

The astrolabe was used as a common instrument among Majorcan sailors and was part of Vasco da Gama's second trip to India in 1502-1503. The astrolabe device allows you to determine the position of the stars, so that navigators, astronomers and scientists, used the device to locate the stars and observe their movements. This could determine latitude and local time.

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;