Faculty of Arts & Science · St. George

AST121H1

Twinkle, Sparkle, Brilliant Sky

Prerequisite2 requirements, 2 options

Total contact hours24 lecture · 12 tutorial

Evidence1 term · 2 papers

Add AST121H1 to Pyko

What was the average?

C+

2.3 GPA across 1 observed term. Most recent: Winter 2023.

How is it graded?

Not yet verified

No syllabus we can lawfully use has been verified for this course.

How confident is this?

Low

A small number of terms, so read it as a range. The most recent observation is several years old.

From the calendar

Official source · Faculty of Arts & Science

This is a first year astronomy course geared towards science students who plan to enter the astronomy programs, as well as other science students that are interested in astronomy. It is an exploration of progresses and puzzles in the field of astronomy, in the era of big data and big observatories. The lead instructor will be an active researcher, who also supplements the lecturers by inviting guest speakers from the astronomy faculty.

Exclusions: AST101H1AST201H1AST210H1AST221H1AST222H1
Contact hours: 24 lecture · 12 tutorial; Total scheduled hours for the course, not per week.

One option from each line

SPH4U Physics

MCB4U Calculus

What people actually got

Last observed Winter 2023

C+

2.3 GPA

1 term observed

n = 1student contributedSt. George offerings only

This is a student-contributed aggregate, not an official University of Toronto record. It is also not a measure of how hard the course is — a course average moves with who enrols in it, not only with the material.

The newest observation is from Winter 2023. Instructors, weighting and exam format may all have changed since — treat this as history, not a forecast.

This rests on 1 reported term. It is shown because hiding it would not make it less true, but one or two results are a datapoint, not a distribution — a single unusual cohort moves this number a long way.

How well we know this course

2020–2024

Pyko’s archive holds 3 documents for AST121H1, across 3 years between 2020 and 2024.

2: Final exams
1: Syllabi

Counts, not a library. Pyko does not host or distribute course files, and this page is not an offer to supply one — the archive is what lets these pages describe how a course is assessed, which matters most where no syllabus has been verified.

What we don’t have yet

Assessment weightingNo syllabus we can lawfully use has been verified for this offering. Contribute yours and the breakdown appears here.

A current averageThe newest verified observation is from Winter 2023. Later terms have no confirmed result yet.

Per-term breakdownHeld back deliberately. Splitting 1 observations across terms would be false precision.

Instructor-level detailAverages are not split by instructor. At these sample sizes the difference between sections is noise, not signal.

Source ledger

Report an error →

Sources behind every claim on this page
Claim	Source	Captured	Status
Course description, prerequisites, exclusions, contact hours	Faculty of Arts & Science	2026-07-25	public fact
Historical average across 1 term	Student contributions, consented	2026-07-25	user contributed aggregate
3 archived documents, 2020-2024	Pyko archive	2026-07-25	index only

Page last verified 2026-07-25. A claim whose source moves is withdrawn before it goes stale.

Around this course

AST101H1Cannot be taken with this course AST201H1Cannot be taken with this course AST221H1Cannot be taken with this course AST222H1Cannot be taken with this course

You’ve read the average. Now use it.

Add AST121H1 and Pyko tracks what you've earned against your own grading scheme.

Add AST121H1 to Pyko See how Pyko works

Pyko is an independent student platform. It is not affiliated with, endorsed by, or operated by the University of Toronto. Course names and codes are used descriptively to identify courses.