Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Magnetic Declination01:19

Magnetic Declination

67
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...
67
Meridians01:28

Meridians

440
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...
440
Polar and Cylindrical Coordinates01:22

Polar and Cylindrical Coordinates

14.7K
The Cartesian coordinate system is a very convenient tool to use when describing the displacements and velocities of objects and the forces acting on them. However, it becomes cumbersome when we need to describe the rotation of objects. So, when describing rotation, the polar coordinate system is generally used.
14.7K
Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

393
In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
393
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

439
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
439
Measuring Reaction Rates03:09

Measuring Reaction Rates

25.4K
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
25.4K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Route-centric ant-inspired memories enable panoramic route-following in a car-like robot.

Nature communications·2025
Same author

Bio-Inspired Approaches-A Leverage for Robotics.

Biomimetics (Basel, Switzerland)·2025
Same author

Passive Polarized Vision for Autonomous Vehicles: A Review.

Sensors (Basel, Switzerland)·2024
Same author

Honeybees Use Multiple Invariants to Control Their Altitude.

Insects·2023
Same author

Visual augmentation of deck-landing-ability improves helicopter ship landing decisions.

Scientific reports·2023
Same author

Quaternion to Euler angles conversion: A direct, general and computationally efficient method.

PloS one·2022

Related Experiment Video

Updated: Jul 23, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

11.5K

SkyPole-A method for locating the north celestial pole from skylight polarization patterns.

Thomas Kronland-Martinet1,2, Léo Poughon1, Marcel Pasquinelli2

  • 1Aix Marseille University, CNRS, ISM, Marseille 13009, France.

Proceedings of the National Academy of Sciences of the United States of America
|July 17, 2023
PubMed
Summary

This study introduces SkyPole, a novel bioinspired optical method for daytime navigation. It uses the Sun’s polarization patterns to determine true north, offering an alternative to GPS and magnetic compasses.

Keywords:
GPS-denied environmentcelestial compasscelestial navigationgeolocationpolarized vision

More Related Videos

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials
06:05

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Published on: January 15, 2014

6.9K
Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
05:54

Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy

Published on: September 8, 2023

1.2K

Related Experiment Videos

Last Updated: Jul 23, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

11.5K
Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials
06:05

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Published on: January 15, 2014

6.9K
Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
05:54

Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy

Published on: September 8, 2023

1.2K

Area of Science:

  • Navigation and orientation
  • Bioinspired technologies
  • Polarimetry

Background:

  • Current methods for determining true north, including Global Navigation Satellite Systems (GNSS), magnetic compasses, and celestial navigation, have significant limitations.
  • GNSS are susceptible to interference, magnetic compasses are affected by magnetic anomalies, and star-based navigation is restricted to nighttime with clear skies.
  • Nature-inspired navigation, such as celestial polarization used by ants and birds, offers potential alternative directional cues.

Purpose of the Study:

  • To develop a bioinspired optical method for determining the north celestial pole during daytime.
  • To provide a reliable alternative to existing navigation systems by leveraging natural light patterns.
  • To enable accurate determination of latitude and bearing with respect to true north.

Main Methods:

  • Developed a bioinspired optical method named SkyPole.
  • Utilized a polarimetric camera to measure the rotation of skylight polarization patterns correlated with the Sun's movement.
  • Applied image difference processing to time-varying polarization measurements.

Main Results:

  • Successfully determined the position of the north celestial pole using daytime skylight polarization patterns.
  • Demonstrated the capability to ascertain the observer's latitude and bearing relative to true north.
  • Validated a novel approach to daytime celestial navigation.

Conclusions:

  • The SkyPole method offers a viable bioinspired alternative for daytime navigation.
  • This technique leverages the predictable rotation of skylight polarization patterns for accurate orientation.
  • The findings contribute to advancements in autonomous navigation and bio-inspired sensing technologies.