How did the Portuguese control the spice trade quizlet?
How did the Portuguese control the spice trade? They did it by using their sea power to set up colonies, setting up the Dutch East India Company, and establishing permanent ties with locals. They were not interested in any European trade items.
What is the device used to measure the angle of the sun and the stars above the horizon?
Sextant, instrument for determining the angle between the horizon and a celestial body such as the Sun, the Moon, or a star, used in celestial navigation to determine latitude and longitude.
How accurate are sextants?
Most sextants also include a vernier on the worm dial that reads to 0.1 minute. Since 1 minute of error is about a nautical mile, the best possible accuracy of celestial navigation is about 0.1 nautical miles (200 m). At sea, results within several nautical miles, well within visual range, are acceptable.
Which stars are used for navigation?
The star Polaris, often called the “North Star”, is treated specially due to its proximity to the north celestial pole. When navigating in the Northern Hemisphere, special techniques can be used with Polaris to determine latitude or gyrocompass error.
Why is there only 1 star in the sky?
| Fomalhaut is sometimes called the Loneliest Star because no other bright stars shine near it in the sky. It appears in a part of the sky that’s largely empty of bright stars. For this reason, in skylore, Fomalhaut is often called the Lonely One or Solitary One. It’s an easy star to spot and one you’ll want to meet.
Why do I see a red star?
So if you’re seeing a bright reddish object looking above the eastern horizon and climbing into the southern sky late at night, you’re looking at Mars. Look in very early October and you’ll see Mars alongside the full “Harvest Moon,” and by mid-October the red planet will be rising at sunset.
What color stars are the coldest?
Red stars
Why is there a star flashing blue and red?
why do stars change their colour constantly every second? red-blue-red-blue………….. This is because of scintillation (“Twinkling”) as the light passes through the atmosphere of the Earth. As the air moves in and out, the starlight is refracted, often different colors in different directions.