【还是星星最靠谱:美国海军为防电子导航系统被黑客攻击,重开“观星识路”课程】

【还是星星最靠谱:美国海军为防电子导航系统被黑客攻击,重开“观星识路”课程】超过1200名海军军校学生今年学习了如何用“航海六分仪”和星象指路——1990年,这门课因新导航系统的广泛应用而停止,至今已有20余年,但所有新学员都必须重新学习这门课,以应对未来可能发生的敌人对航海GPS等进行干扰。范德堡大学的研究小组将协助他们完成这门古老的课程,你是否也感兴趣呢?

http://www.dailymail.co.uk/sciencetech/article-4747640/US-Navy-start-teaching-sailors-navigate-stars.html

US Navy to start teaching sailors to navigate by the stars | Daily Mail Online

US Navy to start teaching sailors to navigate by the stars again amid growing fears of cyberattacks on electronic navigation systems

  • More than 1,200 Navy midshipmen are learning navigation by the stars this year
  • In the 1990's, the Navy stopped teaching it due to new navigation technologies
  • New recruits will now be taught how to use a sextantto navigate 

By Cecile Borkhataria For Dailymail.com

|
US Navy to start teaching sailors to navigate by the stars | Daily Mail Online

This year, more than 1,200 midshipmen with the Naval Reserve Officer Training Corps are learning the ancient art of navigating by the stars for the first time in almost 20 years. 

In the 1990's, the Navy stopped teaching celestial navigation for its officer training curriculum because of increased reliance on navigation technologies such as GPS. 

However, the Navy is now reintroducing this to its training curriculum because of an increased awareness of the vulnerability of navigation systems to hacking. 

Scroll down for videos 

A sextant (pictured) is a device that measures the angle between two objects. The sextant allows the navigator to measure the actual distance from the observer to the geographical position of a celestial body, and all new recruits in the Naval Reserve Officer Training Corps will learn how o use one

A sextant (pictured) is a device that measures the angle between two objects. The sextant allows the navigator to measure the actual distance from the observer to the geographical position of a celestial body, and all new recruits in the Naval Reserve Officer Training Corps will learn how o use one

According to Vanderbilt University researchers, navigating by the stars is a method perfected in 1800s using the horizon, celestial bodies and a tool called a sextant - a device that measures the angle between two objects.  

A sextant allows the navigator to measure the actual distance from the observer to the geographical position of a celestial body.

US Navy to start teaching sailors to navigate by the stars | Daily Mail Online

The program created by Vanderbilt University researcher, called VandyAstroNav , was launched in April 2015 and has been freely available on the internet since then. Pictured is one of the illustrations in the Vandy AstroNav course

The program created by Vanderbilt University researcher, called VandyAstroNav , was launched in April 2015 and has been freely available on the internet since then. Pictured is one of the illustrations in the Vandy AstroNav course

Using the intercept method, navigators can obtain both their latitude and longitude simultaneously by obtaining two or more lines of position from narrowing down the location of celestial bodies observed through a sextant.

Once these lines of position are obtained, their intercept marks the navigator's position.

This Spring, a research team at Vanderbilt University helped midshipmen with their training, led by Dr Susan Stewart, Adjoint Assistant Professor of Astronomy.

The midshipmen learned how to take sightings of various celestial bodies and then consult a set of nautical tables to narrow them down to a geographical position.

HOW TO NAVIGATE BY THE STARS

Navigating by the stars is a method perfected in 1800s using the horizon, celestial bodies and a tool called a sextant - a device that measures the angle between two objects using two mirrors.

A sextant allows the navigator to measure the actual distance from the observer to the geographical position of a celestial body.

Using the intercept method, navigators can obtain both their latitude and longitude simultaneously by obtaining two or more lines of position from the reduction of celestial bodies observed through a sextant.

Once these lines of position are obtained, their intercept marks the navigator's position.

To use a sextant with the sun, the navigator must:

  1. Point the sextant to the horizon
  2. Press the sextant's clamp to release the index bar
  3. Bring the sun to the horizon
  4. Release the clamp and adjust to the sun's position
  5. Swing the sextant to verify the sun's position along the line
  6.  And finally, read the resulting angle

The program, called VandyAstroNav, was launched in April 2015 and has been freely available on the internet since then.

Users have the options to watch the instructional videos alone or register to take the full course.

In the last two years, 1,125 people have signed up for the full course


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