Entries from October 1, 2007 - October 31, 2007

Sunday
Oct072007

A Nineteenth Century Daylight Meteor

Yesterday I came across this image in Astronomy, by George F. Chambers,  1914(?).   The caption reads:

Daylight meteor seen at Penshurst, Kent, June 20, 1866.  Length of coloured portion 1 degree; space traversed in 2 seconds, 80 degrees.  (J. Nasmyth)

A quick search led to The daylight meteor of 1866 June 20, Chris Trayner, WGN, Journal of the International Meteor Organization, vol. 32, no. 4, p. 122, 2004, from which comes the following account by Nasmyth:

While walking in my garden at about a quarter to eleven on the forenoon of June 20th, I was startled to see a bright red comet-shaped object rapidly moving across the clear blue sky about 35 degrees above the horizon.  The length of the meteor was about 1 degree, or twice as long as the Moon appears in diameter.  The motion was majestic, yet rapid, for it traversed a space of 80 degrees in rather less than two seconds.  The direction was from N.W. to S.E.  The advancing end of the meteor was brilliant red, with a white or shining envelope or head; the after part, or tail, was a ragged fan-shape, with a waving motion, accompanied by white vapours, and followed by a faint white vapour-trail.  It disappeared from my sight behind a mass of clouds, and I listened for some time to catch any report or sound of explosion, but I heard none.  The passage of the meteor was nearly parallel to the horizon, but with a slight dip or decline to the S.E.  It is impossible to convey by words the impression left by the appearance of this mysterious object, majestically traversing the clear blue sky during bright sunshine.  Had it made its appearance at night, the whole of England would have seen more or less of its light.

Trayner states that the meteor was seen over Sussex, Kent and from the coasts of northern France, Belgium and even Holland.  "J. Nasmyth" was almost certainly the scottish engineer James Nasmyth, who moved to Kent and took up astronomy after he retired in 1856.

Saturday
Oct062007

How To Disable Firefox Quick Find

[Note added 2009-07-19: The advice given in this post is now out of date.  In modern versions of Firefox it is possible disable Quick Find using the menus.  On windows, click: Tools > Options > Advanced > General and deselect Search for text when I start typing.  On Linux click: Edit > Preferences > Advanced > General and deselect Search for text when I start typing.]

Recently I have found that when I start typing into a text box in Firefox I often get a Quick Find bar coming up at the bottom of the screen.  This happens if I am typing ahead.  Firefox seems to be interpreting characters typed at a web-page as a search string.  I don't remember having asked for this behaviour and I find it rather annoying.  I would much rather have Firefox silently ignore the type-ahead characters.  At least then I would not have to go to the trouble of removing the unwanted Quick Find bar (or sitting and waiting until it removes itself).  Fortunately a little research revealed the following fix:

Enter about:config in the Firefox URL line and click Go.

Select the line starting accessibilty.typeaheadfind and double click it until the Value field is false.

Tuesday
Oct022007

The Tipler Point

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