(Galileo himself had advocated the preparation of such tables for this purpose, but the method, though sound in principle, could not be made practical aboard sailing ships).
On the back of that experience, he published his first book in 1702 on the mathematics of navigation as a practical guide for sailing.
Admiral Zheng He's map was a practical map for sailing with a view from the ship of the landmarks in drawings rather than colourful paintings, and with the compass directions and travel times marked alongside the shipping routes for easy reference.
His primary interest is in the art of origami, but he has great faith in its expanding practical potential — solar sails, air bags, containers, shelters, medical implants.
Focusing on sailing days as practical units of distance and using an Archaic Greek shipwreck off Turkey as a case study, this preliminary model demonstrates how a more nuanced spatial approach can inform the human geography and socioeconomic structures of ancient maritime interaction.
It's a practical thing – they have to sail back to shore.
For example, a Vikings theme day could include drawing Viking stuff, reading about vikings, using stories of Viking sailing to do some practical mathematics in a fun setting.
From a practical standpoint, the minimum overall length for a sailing model is 24 inches (61.0 cm) when sailed among other larger models.
After the armistice, Porter sailed for America with the practical aim of persuading his grandfather to give him an allowance that would be appropriate to the income of Mrs. Thomas, whom he hoped to marry.
Dr. Forward applied this concept of heavenly sailing ships to a somewhat more practical purpose when he designed a satellite, called a statite, that could hover 200,000 miles above one of the poles, held in place by sails filled by solar winds.
