This guide has some good practicals and information on astronomy and has student worksheet appropriate for use in the classroom. The notes on educational standards are for the US.
The introduction to this guide gives a brief, but fairly comprehensive, history of US spacecraft used for astronomy up to the Year 2000.
The guide contains 4 units with practicals and student worksheets:
Unit 1 looks at the atmosphere and gives five practical demonstrations to model how the atmosphere distorts em radiation.
Unit 2 looks at the em spectrum and describes how to build a simple spectroscope, redshift and blue shift using a doppler ball and wavelength and resonance praticals
Unit 3 looks at telescopes and how to build a simple refracting telescope, and a liquid crsytal sheet to demonstrate infra-red detection
Unit 4 contains four practicals which investigate images processing, using colour and coding with binary numbers
Unit 5 gives web links (some outdated at the time of this comment 2012)
There is also a glossary of terms and suggested reading