# Equator

The equator is a circle of latitude, about 40,075 km (24,901 mi) in circumference, that divides Earth into the Northern and Southern hemispheres. It is an imaginary line located at 0 degrees latitude, halfway between the North and South poles. (The term can also be used for any other celestial body that is roughly spherical.) In spatial (3D) geometry, as applied in astronomy, the equator of a rotating spheroid (such as a planet) is the parallel (circle of latitude) at which latitude is defined to be 0°. It is an imaginary line on the spheroid, equidistant from its poles, dividing it into northern and southern hemispheres. In other words, it is the intersection of the spheroid with the plane perpendicular to its axis of rotation and midway between its geographical poles. On and near the equator (on Earth), noontime sunlight appears almost directly overhead (no more than about 23° from the zenith) every day, year-round. Consequently, the equator has a rather stable daytime temperature throughout the year. On the equinoxes (approximately March 20 and September 23) the subsolar point crosses Earth's equator at a shallow angle, sunlight shines perpendicular to Earth's axis of rotation, and all latitudes have nearly a 12-hour day and 12-hour night. (Wikipedia).

Astronomy - Ch. 2: Understanding the Night Sky (7 of 23) Understanding Earth's Longitude & Latitude

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the Earth's longitude and latitude.

From playlist ASTRONOMY 2 THE NIGHT SKY

Teach Astronomy - Orbit Eccentricity

http://www.teachastronomy.com/ Orbital eccentricity is the amount by which an orbit deviates from a circle. Mathematically it's defined as the distance between the two foci of an elliptical orbit divided by the major axis. A circle has an ellipticity, denoted by the little symbol "e", of

From playlist 10. The Solar System

Astronomy - Ch. 7: The Solar Sys - Comparative Planetology (16 of 33) Planet's Tilt

Visit http://ilectureonline.com for more math and science lectures! In this video I will discuss the various planet inclinations of the equator to orbit in our Solar System. Next video in this series can be seen at: http://youtu.be/SNf3ppk1UY8

Where Is The Earth Located?

You're there, and I'm here. And we're all on the Earth. But where is the Earth? In the Solar System, obviously, which is in the Milky Way, and so on. Think about your place in the cosmos, your exact spot in the Universe relative to everything else. It's time to get your bearings, and once

From playlist Planets and Moons

「かぐや」HDTVによる雨の海と虹の入り江

From playlist Earth's place in Solar System - Jaxa

Teach Astronomy - Galactic Coordinates

http://www.teachastronomy.com/ Astronomers use a special set of coordinates to define the position of objects within the Milky Way galaxy. The galactic equator runs along the center of the Milky Way band. Galactic longitude, abbreviated by the small letter L, is the angular distance alon

From playlist 18. Galaxies

Astronomy - Ch. 7: The Solar Sys - Comparative Planetology (15 of 33) Planet Orbital Eccentricity

Visit http://ilectureonline.com for more math and science lectures! In this video I will discuss the various orbital eccentricities of the planets in our Solar System. Next video in this series can be seen at: http://youtu.be/igAZ0bSyi2c

「かぐや」HDTVによるオリエンタレ・ベイスン

From playlist Earth's place in Solar System - Jaxa

Teach Astronomy - Astronomical Units

http://www.teachastronomy.com/ The astronomical unit is defined as the mean distance between the Earth and the Sun. It has to be defined as the mean because the orbit is elliptical by a couple of percent. The astronomical unit is 150 million kilometers or 98 million miles. This sets the

From playlist 11. Interplanetary Bodies

Peter van der Kamp: On CAC and Backlund transformations

Abstract: This talk summarizes joint work with D.J. Zhang, D.D. Zhang and X. Wei, on multi-component extensions of CAC systems, how to obtain auto-Backlund transformations from auto-Backlund transformations, and torqued ABS equations, see papers 33, 37, and 40 from https://wiskun.de/publi

From playlist Integrable Systems 9th Workshop

2 Equations 2 Unknowns. A High School Math Explainer

0:00 Intro 0:58 The substitution method 08:12 The like coefficients method 14:09 The determinant method 20:33 Discussion Equations: https://youtu.be/NtX98LNHO6k In algebra, a system of two equations with two unknowns can be solved by several different methods. This video covers algebraic

From playlist Summer of Math Exposition 2 videos

Progress in Symbolic Differential Equations

During this talk I will give an overview of recent developments, new features and improvements in Wolfram Language related to symbolic solutions of ordinary differential equations. I will begin by speaking about the recently introduced DSolve option IncludeSingularSolutions, which allows o

From playlist Wolfram Technology Conference 2022

(0.3.101) Exercise 0.3.101: Classifying Differential Equations

This video explains how to classify differential equations based upon their properties https://mathispower4u.com

(0.3) Lesson: Classifying Differential Equations

This video explains how to classify differential equations based upon their properties https://mathispower4u.com

Mod-03 Lec-11 Exact Equations

Ordinary Differential Equations and Applications by A. K. Nandakumaran,P. S. Datti & Raju K. George,Department of Mathematics,IISc Bangalore.For more details on NPTEL visit http://nptel.ac.in.

Mod-01 Lec-13 Solving ODE - BVPs and PDEs Using Finite Difference Method

Advanced Numerical Analysis by Prof. Sachin C. Patwardhan,Department of Chemical Engineering,IIT Bombay.For more details on NPTEL visit http://nptel.ac.in

Introduction to differential equations | Lecture 1 | Differential Equations for Engineers

Classification of differential equations into ode/pde, order, linear/nonlinear. Some examples are explained. Join me on Coursera: https://www.coursera.org/learn/differential-equations-engineers Lecture notes at http://www.math.ust.hk/~machas/differential-equations-for-engineers.pdf Subs

From playlist Differential Equations for Engineers

Systems of equations: algebra and geometry

This is part of an online course on beginner/intermediate linear algebra, which presents theory and implementation in MATLAB and Python. The course is designed for people interested in applying linear algebra to applications in multivariate signal processing, statistics, and data science.

From playlist Linear algebra: theory and implementation

Solving Simultaneous Equations GCSE 9-1 Maths

In this video, we go through example questions on solving linear simultaneous equations using the eliminate method! Simultaneous equations are an important topic for both higher and foundation GCSE 9-1 maths students! Next up, simultaneous equations word problems for GCSE maths!

From playlist Foundation GCSE 9-1 Algebra

Teach Astronomy - Orbit Inclination

http://www.teachastronomy.com/ For most planets in the solar system the orbital inclination is very small. That is, the axis defined by the north and south poles of the planet is almost exactly perpendicular to the plane of the planet's orbit of the Sun. The only two exceptions to this a

From playlist 10. The Solar System