New Visibility Chart – Sydney (NSW)

I have decided to modify the cloud chart slightly by adding a new feature to it……. a Visibility Chart. This has now been updated and added to the sticky post at the top of the page.

I believe I have worked out a way to calculate the visibility conditions on any night…… but this is still experimental and thus it is in Beta mode. As observers will be spread through out Sydney in various suburbs and observation points, there is absolutely no way that this chart can predict actual sky conditions with light pollution in your specific area having an effect.

Visibility Chart (Click to Enlarge)

Visibility Chart (Click to Enlarge)

If you have setup your telescope next to the Sydney Cricket Ground or at Olympic Park and the stadium suddenly turns on all of it’s lights, then visibility will be diminished and this chart will not predict it.

So this chart will tell you instead if visibility is reduced by atmospheric conditions, dust storms as we had last month or even smoke from bushfires which all play a part in how observing conditions are each night.

Just to stress again, this is still pretty much in Beta mode at the moment while I determine how accurate it is in accounting for temperature, dew point,smog, water vapor and all other factors that can effect a nice clear view of the night sky.


I have made some minor changes to account for the various locations in Sydney which each have various visibility conditions. For example one location in Sydney’s west had two consecutive days in the last week of very poor seeing conditions due to pollution. The question is how to report it when other areas in Sydney had good visibility at the same time.

~ by sydneystargazers on October 21, 2009.

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