The International Remote Astronomy Olympiad 2021, problems scheme

Problems to solve by Contestants from the Groups: Minor
variations possible
Rounds
(options) Duration
(pure time) Group a Group b Group g Between a
and b,g

Theoretical round,
option (1): 9 problems 3¾^h - 4¼^h Problems 1-6 Problems 4-9 Problems 1-9 Problems 4-6

Theoretical round,
option (2): 8 problems 3¾^h - 4¼^h Problems 1-6 Problems 3-8 Problems 1-8 Problems 3-6

Theoretical round,
option (3): 8 problems 3½^h - 4^h Problems 1-5 Problems 4-8 Problems 1-8 Problems 4-5

Theoretical round,
option (4): 7 problems 3½^h - 4^h Problems 1-5 Problems 3-7 Problems 1-7 Problems 3-5

Practical round,
3 problems 3¼^h - 4^h Problems 1-2 Problems 2-3 Problems 1-3 Problem 2

Round
on maps and images ⅜^h - 1^h A l l q u e s t i o n s Any question

	Problems to solve by Contestants from the Groups:				Minor variations possible
Rounds (options)	Duration (pure time)	Group a	Group b	Group g	Between a and b,g
Theoretical round, option (1): 9 problems	3¾^h - 4¼^h	Problems 1-6	Problems 4-9	Problems 1-9	Problems 4-6
Theoretical round, option (2): 8 problems	3¾^h - 4¼^h	Problems 1-6	Problems 3-8	Problems 1-8	Problems 3-6
Theoretical round, option (3): 8 problems	3½^h - 4^h	Problems 1-5	Problems 4-8	Problems 1-8	Problems 4-5
Theoretical round, option (4): 7 problems	3½^h - 4^h	Problems 1-5	Problems 3-7	Problems 1-7	Problems 3-5
Practical round, 3 problems	3¼^h - 4^h	Problems 1-2	Problems 2-3	Problems 1-3	Problem 2
Round on maps and images	⅜^h - 1^h	A l l q u e s t i o n s			Any question