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Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.
What do chocolate and mayonnaise have in common? It's maths! Find out how in this podcast featuring engineer Valerie Pinfield.
Is it possible to write unique music with the limited quantity of notes and chords available? We ask musician Oli Freke!
How can maths help to understand the Southern Ocean, a vital component of the Earth's climate system?
Was the mathematical modelling projecting the course of the pandemic too pessimistic, or were the projections justified? Matt Keeling tells our colleagues from SBIDER about the COVID models that fed into public policy.
PhD student Daniel Kreuter tells us about his work on the BloodCounts! project, which uses maths to make optimal use of the billions of blood tests performed every year around the globe.
Since the sun is very far away, the rays from the sun will be almost parallel to both the earth and the sun. So this means the angle of rays between the sun and the moon will be very small. Given the moon is perpendicular to the earth, we have 90 deg on that angle. Since the angles of a triangle add up to 180 deg, the remaining angle is very close to 90 deg, so 89.5 is a good approximation. (It could be 89.8 or 89.7) The result will be similar.