Finally found a bit of time to get a star chart for the June night sky done.
Based on my location in Northumberland - download the high quality PDF here because it contains a lot more information about the star chart and some of the stars, planets and other sights visible in the sky this month.
I'm a big fan of LaTeX and PSTricks and I use them often to create diagrams and graphs for my various maths and astronomy lecture notes. But to create this lunar phase diagram it was much more convenient to use another package called TikZ!
It's a pretty standard diagram; sunlight is shown streaming from the right. The Earth is at the centre with the moon shown in a (blue) circular orbit and presented at various positions around the orbit. The phase of the moon (the shape of the illuminated portion we see from Earth) is shown outside the orbit. I added some arrows and arcs to show the traditional waxing (growing larger) and waning (growing smaller) sections of the orbit and finally, the number of days since new moon.
Technical details of the code below the fold.
I don't think the MESSENGER mission to Mercury ever captured the imagination of the general public in the same way Cassini is still doing at Saturn. MESSENGER ended its 11 year mission yesterday. With no more fuel aboard the spacecraft the peturbing force of solar gravity finally brought MESSENGER down with a bang on the surface. Prior to 2011 Mercury was a largely unknown planet with just one-third of its surface imaged in the 1970s. MESSENGER has transformed our view of Mercury since its first flyby in 2011 and sent back views of the planet like these:
Mercury has clearly been battered and scarred from impacts sustained since the earliest days of the solar system.
Meanwhile, on the other side of the solar system the New Horizons spacecraft is hurtling towards a July rendezvous with an ex-planet called Pluto. New Horizons is now close enough to Pluto - a world even smaller than Mercury - for its cameras to pick out surface details:
NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute
The orbiting moon is called Charon and it's quite big compared to Pluto. Pluto appears to wobble because the centre of mass (the barycentre) of Pluto and Charon is some way outside Pluto. The close-up view shows a lot of variation in brightness across the disk. Clearly Pluto is going to be an interesting place to see when New Horizons eventually arrives!
Dr Adrian Jannetta
Guitar strummin' explorer of the universe. Mild mannered maths teacher by day and astronomer by night.