Celestial Navigation Concepts and Techniques

The video tutorial explains celestial navigation, focusing on the concept of picture points, assumed positions, and azimuth. It details how to calculate and compare observed and calculated altitudes to determine one's position using nautical charts. The tutorial also covers the practical application of these concepts, including using position lines and the intercept method to find one's location by observing celestial bodies like the sun.

What is the term used for the point where a celestial object's beam cuts through the Earth's surface at a right angle?

• Picture Point

• Calculated Altitude

• Azimuth

• Assumed Position

What is the purpose of the site reduction tables in celestial navigation?

• To measure the observed altitude

• To plot the position line

• To find the exact time on board

• To determine the azimuth and calculated altitude

Why is it crucial to have an exact time on board during celestial navigation?

• To ensure the picture point is correctly plotted

• To measure the azimuth accurately

• To calculate the intercept

• Because the picture point moves quickly due to Earth's rotation

What does the difference between observed altitude (h0) and calculated altitude (hc) represent?

• The position line

• The azimuth angle

• The nautical miles of the intercept

• The exact time on board

In the intercept method, what is plotted on the chart?

• The assumed position and intercept

• The exact time

• The picture point of the sun

• The azimuth

What is the purpose of drawing a line perpendicular to the azimuth on a chart?

• To measure the observed altitude

• To mark the picture point

• To indicate the exact time

• To create the position line

Why might the moon not be visible during daytime navigation?

• Because of the azimuth angle

• Due to the calculated altitude

• Due to the sun's brightness

• Because of the Earth's rotation

How is the position line determined using the sun?

• By measuring the azimuth

• By plotting the picture point

• By calculating the intercept

• By shooting the sun twice at different times

What happens if you have moved between two sun shots?

• You need to find a new picture point

• You should measure the observed altitude again

• You need to recalculate the azimuth

• You must transfer the first position line

What is celestial navigation in a nutshell?

• Using the moon to find the azimuth

• Using celestial objects to determine position

• Plotting the picture point on a chart

• Calculating the exact time on board