The Notebooks of Leonardo Da Vinci

Contents:
Author: Leonardo da Vinci

883.

To measure how many times the diameter of the sun will go into its course in 24 hours.

Make a circle and place it to face the south, after the manner of a sundial, and place a rod in the middle in such a way as that its length points to the centre of this circle, and mark the shadow cast in the sunshine by this rod on the circumference of the circle, and this shadow will be—let us say— as broad as from a to n. Now measure how many times this shadow will go into this circumference of a circle, and that will give you the number of times that the solar body will go into its orbit in 24 hours. Thus you may see whether Epicurus was [right in] saying that the sun was only as large as it looked; for, as the apparent diameter of the sun is about a foot, and as that sun would go a thousand times into the length of its course in 24 hours, it would have gone a thousand feet, that is 300 braccia, which is the sixth of a mile. Whence it would follow that the course of the sun during the day would be the sixth part of a mile and that this venerable snail, the sun will have travelled 25 braccia an hour.

Contents:

Download Options


Title: The Notebooks of Leonardo Da Vinci

Select an option:

*Note: A download may not start for up to 60 seconds.

Email Options


Title: The Notebooks of Leonardo Da Vinci

Select an option:

Email addres:

*Note: It may take up to 60 seconds for for the email to be generated.

Chicago: Leonardo da Vinci, "883.," The Notebooks of Leonardo Da Vinci, trans. Richter, Jean Paul, 1847-1937 in The Notebooks of Leonardo Da Vinci (New York: Dover Publications, Inc., 1970), Original Sources, accessed February 3, 2023, http://www.originalsources.com/Document.aspx?DocID=8N895Z6W7BJ4MDH.

MLA: Vinci, Leonardo da. "883." The Notebooks of Leonardo Da Vinci, translted by Richter, Jean Paul, 1847-1937, in The Notebooks of Leonardo Da Vinci, New York, Dover Publications, Inc., 1970, Original Sources. 3 Feb. 2023. http://www.originalsources.com/Document.aspx?DocID=8N895Z6W7BJ4MDH.

Harvard: Vinci, LD, '883.' in The Notebooks of Leonardo Da Vinci, trans. . cited in 1970, The Notebooks of Leonardo Da Vinci, Dover Publications, Inc., New York. Original Sources, retrieved 3 February 2023, from http://www.originalsources.com/Document.aspx?DocID=8N895Z6W7BJ4MDH.