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Meridians

Meridians

In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...

Kepler's Second Law of Planetary Motion

Kepler's Second Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...

Kepler's First Law of Planetary Motion

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...

Magnetic Declination

Magnetic Declination

Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...

Impact: Problem Solving

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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...

Azimuths and Bearings

Azimuths and Bearings

Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...

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Related Experiment Video

Updated: Jul 20, 2026

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Two years at Meridiani Planum: results from the Opportunity Rover.

S W Squyres¹, A H Knoll, R E Arvidson

¹Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA.

Science (New York, N.Y.)

|September 9, 2006

Summary

The Mars Exploration Rover Opportunity discovered evidence of ancient liquid water and acidic groundwater in Meridiani Planum. These findings suggest past arid, oxidizing surface conditions with occasional water flow.

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Area of Science:

Planetary Science
Geology
Astrobiology

Background:

The Mars Exploration Rover Opportunity has been exploring Meridiani Planum for over two years.
This region is known for its unique geological features and potential for past habitability.

Purpose of the Study:

To analyze geological and chemical evidence from Meridiani Planum to understand ancient Martian environmental conditions.
To investigate the role of water and chemical processes in shaping the Martian surface.

Main Methods:

In-situ analysis of rock strata and surface features by the Opportunity rover.
Microscopic imaging and chemical composition analysis of Martian rocks and soil.

Main Results:

Discovery of well-developed cross-lamination indicating formation in flowing liquid water.
Identification of abundant hematite concretions and possible halite-related features.
Evidence of significant chemical alteration in outcrop rocks from a basaltic precursor.
Observation of thick weathering rinds, resistant fracture fills, and polygonal fractures.

Conclusions:

Meridiani Planum once experienced abundant acidic groundwater and arid, oxidizing surface conditions.
Evidence suggests occasional liquid water flow on the ancient Martian surface.
The findings provide insights into Mars's past habitability and geological evolution.