Morning Brief: Monday Waning Crescent in Leo Map Tests $85,952 BTC, $90.00 WTI, SPCX, and STRC Yield into S&P Global Composite PMI Final

In the section on failure to follow rules, Gann links frequent changes of position to taxes, interest, and commission. This is a concrete channel through which reacting to every small move can damage results. The cost does not depend on whether the next directional opinion sounds convincing; it is incurred by the trading activity. Use an explicitly synthetic cost model rather than a claim about any broker. Suppose each completed round trip uses $10,000 notional and incurs $10 of total friction. Twenty round trips then cost $200. If the trades produce $150 of gross profit in total, the account finishes with a $50 net loss. The missing quantity in a gross-profit story is the cumulative hurdle paid to obtain it. The same worksheet can separate commission, spread, slippage, and financing instead of combining them. Do not charge a round-trip assumption again for each leg, and do not infer that zero advertised commission means zero friction. Compare gross results and net results under the same trades and dates. This teaches a different lesson from simply trading less: a change of position needs enough expected benefit to justify its added cost.

Try it

Synthetic model: twenty round trips each incur $10 total cost and together earn $150 before costs. Find total cost and net profit or loss.

Limits

The $10 cost is assumed, not a current broker quote. Taxes and financing depend on the account and instrument. The example establishes arithmetic, not an optimal trading frequency.

Source

W. D. Gann, Truth of the Stock Tape (1923), Book II, Chapter IX, Methods of Operating, Failure to Follow Rules, printed p. 47. Primary source: Internet Archive scan of the original printed book; passage cross-checked against archived OCR and local Gann Study Group transcription. Synthetic examples and modern calculations are editorial, not historical Gann trades.

Today

Using the latest two completed SPY daily closes (2026-10-01 and 2026-10-02), the one-share gross change is +5.65; after an editorial 10 bp round-trip friction assumption, the net scenario is +4.89. This is latest-session arithmetic, not a broker fee or trade recommendation. NYSEARCA:SPY, Latest session 2026-10-02T13:30:00Z: P1_close - P0_close - 0.001*P0_close = 4.886034 USD per share (inputs: P0_close=763.98999, P1_close=769.640015, assumed_friction_rate=0.001, assumed_friction_usd_per_share=0.76399). Data source 1

Calculated astronomy: Horizons quantity 9 separates apparent visual magnitude from surface brightness. The latter is the average airless visual magnitude per square arcsecond of the illuminated apparent disk. One describes the integrated target; the other accounts for the angular area over which its light is spread. The manual writes surface brightness as V plus 2.5 times the base-ten logarithm of illuminated angular area, with that area represented by its disk-model factors. In a simple teaching case, let integrated magnitude V be zero and illuminated area be 100 square arcseconds. The correction is 2.5 times log10(100), or five. Surface brightness is therefore five magnitudes per square arcsecond. The area is the illuminated area, not automatically the entire disk. This distinction explains why a magnitude column and a surface-brightness column need different unit labels even when both contain magnitude-like numbers. It also supplies a spreadsheet check: using a diameter in arcseconds where the formula expects an area in square arcseconds is a dimensional error. Preserve the model's limits rather than interpreting every decimal as an exact observation.

Try it

Use the stated formula for V = 0 and illuminated area = 100 square arcseconds. What is surface brightness, and why is inserting diameter instead of area wrong?

Limits

Horizons magnitudes are model estimates with object-specific limits. This exercise does not model atmospheric extinction or establish any connection between planetary brightness and markets.

Source

NASA/JPL, Horizons System manual, Observer-table quantity 9, "Visual magnitude & surface brightness," definition and "Surface brightness" formula. Primary NASA/JPL technical documentation; calculated astronomy, not astrological doctrine.

Today

At the BTC minute close, Venus APmag -4.69, illumination 11.078%, and angular diameter 51.434″ give a circular-disk surface-brightness estimate 1.22; JPL reports 1.22, so the difference is +0.00 within formula/shape-model tolerance rather than a market signal. BTC-USD close synchronized with geocentric Venus, As of 2026-10-05T11:00:00Z: APmag + 2.5*log10((Illu_pct/100)*pi*(Ang_diam_arcsec/2)^2) = 1.21511 mag/arcsec^2 (inputs: APmag=-4.69, Ang_diam_arcsec=51.43373, Illu_pct=11.07792, JPL_S_brt=1.215, illuminated_area_arcsec2=230.167578, price_usd=86102.62). Data source 1 Data source 2