“A good watch may serve to keep a recconing at Sea for some days and to know the time of a Celestial Observ[at]ion: and for this end a good Jewel watch may suffice till a better sort of Watch can be found out. But when the Longitude at sea is once lost, it cannot be found again by any watch.”

— Isaac Newton

Letter to Josiah Burchett (1721), quoted in Longitude (1995) by Dava Sobel, p. 60
Board of Longitude

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Do you have more details about the quote "A good watch may serve to keep a recconing at Sea for some days and to know the time of a Celestial Observ[at]ion: and …" by Isaac Newton?

Isaac Newton 171

British physicist and mathematician and founder of modern c… 1643–1727

Iris Murdoch book The Bell

Source: The Bell

“Watching storms
Start to form
Over America.
Can't do anything.
Just watch them swing
With the wind
Out to sea.”

Kate Bush (1958) British recording artist; singer, songwriter, musician and record producer

Song lyrics, Hounds of Love (1985), The Ninth Wave

“You may think you are a good person hanging out with the wrong crowd, but to someone watching, the difference is not noticeable.”

Steve Maraboli (1975)

Source: Life, the Truth, and Being Free (2010), p. 127

“Being at sea is like watching the whole world in high-definition.”

Abby Sunderland (1993) Camera Assistant, Inspirational Speaker and Sailor

Source: Unsinkable: A Young Woman's Courageous Battle on the High Seas (2011), p. 88

“They were watching, out there past men's knowing, where stars are drowning and whales ferry their vast souls through the black and seamless sea.”

Cormac McCarthy (1933) American novelist, playwright, and screenwriter

Source: Blood Meridian, or the Evening Redness in the West

“Keep a watch out, fools! There are things out there and you know what happens when things arrive!”

Steven Erikson book The Bonehunters

The Bonehunters (2006)

“I think this may be something we need to be on the watch out for.”

Douglas Adams (1952–2001) English writer and humorist

Speech http://www.biota.org/people/douglasadams/index.html at Digital Biota 2 http://www.cyberbiology.org/, Cambridge, UK, (1998) 
Context: Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, may have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for. We all know that at some point in the future the Universe will come to an end and at some other point, considerably in advance from that but still not immediately pressing, the sun will explode. We feel there's plenty of time to worry about that, but on the other hand that's a very dangerous thing to say.