What is meridian passage time?

What is meridian passage time?

The time of the meridian passage is the mean between the times of step 1 and step 3. Convert to GMT by adding the local time zone value. The altitude of the meridian passage is the culmination altitude, recorded in step 2.

How do you solve the meridian passage?

Meridian Passage – Short Method.

1. Latitude and declination same names but latitude greater than declination: LAT = DEC + (90o – ALT)
2. Latitude and declination same names but declination greater than latitude: LAT = DEC – (90o – ALT)
3. Latitude and declination opposite names: LAT = (90o – ALT) – DEC.

How do you calculate local apparent time?

LSTM = The local standard time meridian, measured in degrees, which runs through the center of each time zone. It can be calculated by multiplying the differences in hours from Greenwich Mean Time by 15 degrees per hour.

Why do we solve meridian passage?

A Meridian Passage is a quick method of getting a position line that happens to be your Latitude. This occurs once a day at your local noon, when the sun is directly overhead. In fact, its GHA will be the same as your Longitude. It is a lot simpler to work out, and does not require precise time.

What is the use of meridian passage?

The position at the Meridian passage is the position of the ship when the sun is on the observer’s celestial meridian. That is when the sun is directly (and exactly) above the observer’s head.

What is the purpose of meridian passage?

What is difference between local time and standard time?

Local time indicates the time of a place determined on the basis of apparent movement of the sun. Standard time refers to the fixed time for places falling in the same meridian, set in a country by law. Changes continuously with the change in longitude. Remains same for a particular country.

What is local apparent time?

Local apparent time is that for the meridian of the observer. When the apparent (true) sun is (ahead of/behind) the mean sun, apparent time is (faster/slower) than mean civil time. The difference between apparent and civil time at any instant is called the equation of time.

What is upper meridian passage?

A meridian is an imaginary great circle on the celestial sphere that passes through the north and south celestial poles and an observer’s zenith. An Upper Meridian transit occurs when a celestial object moves across the upper meridian. …

What is meant by Meridian passage?

Meridian Passage occurs when a celestial body crosses the observer’s meridian of longitude and at that instant, it will reach its greatest altitude above the observer’s horizon. NOS represents the horizon. O represents the position of the observer. X represents the position of the Sun.

What is the importance of knowing the sun’s meridian passage?

We use the Sun’s Meridian passage to get the second position line. In Mer-Pass, we measure the sextant altitude of the body when it is on the observer’s Meridian, i.e directly above the head of the observer.