Solar Eclipse - Australia Day

I hope you can see that clearly enough; little bite taken out of the solar disc. Here we go - how to make a pinhole camera: d = 1.9 √f.λ where d is the diameter of hole, f is the distance from hole to paper, and λ is wavelength for light, about 550nm. Convert everything to metres and all we needed was a hole 0.432mm across. Easy! Cameron just happened to have a sewing kit with a needle [i]exactly[/i] that width, fancy that.

Australia Day, and a few questions

February 2nd 2009
A short entry this time. I've had a relaxing 10 days in Perth doing next to nothing. After 4 months of peering at computer screens, copying numbers and directions into my notebook; buying tickets in a foreign language; booking flights and bus tickets - and I have done all this without making one mistake with my credit card; reading the guidebook and trying to come up with what to do ... read more

Oceania » Australia » Western Australia » Perth

Aboriginal settlers arrived on the continent from Southeast Asia about 40,000 years before the first Europeans began exploration in the 17th century. No formal territorial claims were made until 1770, when Capt. James COOK took possession in the name... ... read more

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