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If it's difficult to find a bright enough star from his Sydney suburb, perhaps Mark could use Saturn for ALT aligning. It's very near the celestial equator at the moment, and its own motion should be negligible for the purpose.
According to my SNPro, Saturn is 30 deg. above the eastern horizon tonight (Tuesday) at 23:30 (daylight saving time) and at 30 deg. in the west tomorrow morning at 05:30 am. It might even be visible through the trees!
Will this work?
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